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Intrusive igneous activity
In this unit we discover geological features created by intrusive igneous activity.
What’s the difference between extrusive and intrusive geological activity?
Where in a course do we teach this? One idea is to follow the sequence in Earth Science, by Tarbuck, Lutgens, and Tasa.
Volcanoes and other igneous activity
Volcanic eruptions
Lava flows and gases
Anatomy of a volcano
Volcanic hazards
Calderas
Fissure eruptions and basalt plateaus
Volcanic necks and pipes
Intrusive Igneous Activity
Nature of Intrusive Bodies
Tabular Intrusive Bodies: Dikes and Sills
Massive Intrusive Bodies: Batholiths, Stocks, and Laccoliths
Partial melting and the origin of magma
What are intrusive igneous bodies?
A body of hot magma is less dense than the rock surrounding it, so it has a tendency to move very slowly up toward the surface.
It does so in a few different ways, including filling and widening existing cracks, melting the surrounding rock (called country rock, pushing the rock aside (where it is somewhat plastic), and breaking the rock.
Some upward-moving magma reaches the surface, resulting in volcanic eruptions, but most cools within the crust. The resulting body of rock is known as a pluton.
https://opentextbc.ca/geology/chapter/3-5-intrusive-igneous-bodies/ Physical Geology by Steven Earle, BCcampus Open Publishing.
Plutons
A body made when a blob of hot magma started to rise but then cooled within the crust.
“A pluton is a large mass of igneous rock formed originally below ground – basically, an intrusion. They come in various sizes and shapes, and different shapes have different names.
‘Pluton’ is the general term for ‘all large igneous intrusions, of any and all sizes, shapes and compositions’.”
What are plutons and what are the different types of it?
https://www.nps.gov/subjects/geology/intrusive-igneous-landforms.htm
https://www.geologyin.com/2018/03/types-of-intrusive-igneous-rock.html
Why are these called plutons?
The name is supposed to be obvious – these massive bodies developed in the underworld. In classical Greek and Roman mythology the underworld was ruled by Hades (ᾍδης), later known as Pluto.
Hades was the god of the dead and king of the underworld; eventually the underworld itself also became known as Hades. Pluto is the most common name for this deity today.
Pluto and his brothers, Zeus and Poseidon, defeated their father’s generation of gods, the Titans, and claimed rulership over the cosmos. Pluto/Hades received the underworld, Zeus the sky, and Poseidon the sea, with the solid earth, long the province of Gaia, available to all three concurrently.
Hades is typically portrayed holding a bident and wearing his helm with Cerberus, the three-headed guard dog of the underworld, standing to his side.
In later centuries the Romans refered to Pluto as Dīs Pater.
Batholiths
Large irregular-shaped plutons. They have a surface exposure of at least 100 square kilometres (40 sq mi)
Usually made of granite, quartz monzonite, or diorite.
Definition:
Despite sounding like something out of Harry Potter, a batholith is a type of igneous rock that forms when magma rises into the earth’s crust, but does not erupt onto the surface. The magma cools beneath the earth’s surface, forming a rock structure that extends at least one hundred square kilometers across (40 square miles), and extends to an unknown depth.
Etymology:
Bath– comes from the Greek for “deep,” and -lith, also from Greek, means “rock.” For instance, another name for the Stone Age is the Paleolithic age.
Use/Significance in the Earth Science Community:
Batholiths and other geologic formations are important to geologists and geophysicists, as various rock types have different meanings for natural hazards, mineral resources, and ecology.
USGS Use:
Knowing the origin and type of rock formations is helpful to a variety of USGS scientific projects. Batholiths are often subject to significant internal stress, which affects natural hazards like landslides and earthquakes. In addition, since batholiths are nearly always made of rocks that contain feldspar and quartz, knowing the location of batholiths helps with our mineral studies.
This section from USGS (United States Geological Survey), U.S. Department of the Interior
Batholith example – The heart of California’s Sierra Nevada mountains is carved from a granitic batholith
Stocks – Large irregular-shaped plutons, smaller than batholiths. Has a surface exposure of less than 100 square kilometres (40 sq mi)
Tabular intrusive bodies: dikes and sills
Sill – a tabular concordant igneous intrusion
Tabular – broad and flat like the top of a table.
Concordant – runs parallel to other rock strata around it. Sills are sheets parallel to sedimentary beds.
“A sill is a flat, sheet-like igneous rock mass that forms when magma intrudes into and crystallizes between preexisting rock layers. Sills can form from magmas with a range of silica contents. These features can vary from less than one inch up to hundreds of feet thick and can extend for many miles.”
Sills are fed by dikes. Magma is pushed up a dike, and then may flow sideways, when pushing against brittle regions. The force of magma fractures this rock, allowing more magma to flow in.
The Palisades in NJ and NY and sills
Example – “The tabular mass of quartz trachyte near the summit of Engineer Mountain near Silverton, Colorado is a well-known example of a sill.”
Dikes (Dykes)
– A sheet of rock (aka tabular structure) formed in a fracture of a pre-existing rock body. They can be made in two ways:
Magmatic dikes form when magma flows into a crack. Then it solidifies. It may cut across layers of rock or through a contiguous mass of rock.
Clastic dikes are formed when sediment fills a pre-existing crack.
Dikes are discordant – not parallel to the other strata around it.
They usually cross through other layers at a steep angle.
https://en.wikipedia.org/wiki/Dike_(geology)
Igneous Rocks and Volcanic Landforms
and
Cross-cutting relationships can be used to determine the relative ages of rock strata and other geological structures.
A – folded rock strata cut by a thrust fault.
B – large intrusion (cutting through A)
C – erosional angular unconformity (cutting off A & B) on which rock strata were deposited.
D – volcanic dike (cutting through A, B & C).
E – even younger rock strata (overlying C & D)
F – normal fault (cutting through A, B, C & possibly E).
Here is a diabase dike at Hance Rapid on the Colorado River. It cross-cuts the Hakatai Shale. Grand Canyon National Park, Arizona.
Next image from Geologic Principles: Cross-cutting Relationships, US NPS
Here is one of the amazing, famous dikes leading to the well known Shiprock formation. Shiprock (Navajo: Tsé Bitʼaʼí, “rock with wings” or “winged rock”.)
Located in Navajo Nation, San Juan County, New Mexico, United States. It is about 10.75 miles (17.30 km) southwest of the town of Shiprock, which is named for the peak.
These wall-like sheets are made of what was once lava.

Photo by Louis J. Maher, Jr., http://geoscience.wisc.edu/~maher/air/air00.htm
Giant Dikes in northeast America
Dike swarms
Ring dikes
Laccoliths
A laccolith is a shallow, typically mushroom-shaped, igneous intrusion that has deformed the overlying host rock.
“A laccolith forms when molten magma forces its way into a rock formation, then cools and hardens. As the surrounding rock erodes away, the hardened former magma remains.” – USGS
“laccolith is a sheet-like intrusion that has been inserted between the two layers of sedimentary rocks. Due to the intense pressure of the magma, the overlying strata are forced upward and folded, giving the laccolith a dome or mushroom-like form (or feasibly conically or wedge shape) with a substantially planar base. As time goes on, erosion can form small mountains or hills around a central peak as magma rock is likely more susceptible to weathering than the host rock.
The laccolith growth can take as little or a few months when related to the injection of a single magma event or up to a hundred or thousands of years by multiple magnetic pulses, assembling sills on top of each other and impairing the host rock steadily. “
https://www.vedantu.com/geography/laccolith
Famous example: Torres del Paine National Park, Chile
Where is this? Start by locating South America.
Then look in southern Chile near the border of Argentina. Finally, look at the close up of features.
For more about this see Torres del Paine National Park (NASA Earth Observatory) and Torres del Paine – The Patagonian Diamond
An American example: Devil’s Tower, Black Hills, Wyoming
Volcanic pipes
These are subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes.
They may have a circular, elliptical, or even irregular cross-section.
Pipes once served as a conduit for the movement of magma from one location to another.
They are usually vertical. We see a volcanic pipe here labeled as #6.
Basic types of intrusions: 1. Laccolith, 2. Small dike, 3. Batholith, 4. Dike, 5. Sill, 6. Volcanic neck, pipe, 7. Lopolith.
Also see https://en.wikipedia.org/wiki/Volcanic_pipe
Learning Standards
NGSS
HS-ESS2-1 – Develop a model to illustrate how Earth’s internal and surface processes operate at different spatial and temporal scales to form continental and ocean-floor features.
Emphasis is on how the appearance of land features … are a result of both constructive forces (such as volcanism, tectonic uplift, and orogeny) and destructive mechanisms (such as weathering, mass wasting, and coastal erosion).
HS-ESS2 Earth’s Systems – Cross-cutting concepts: Stability and Change
* Much of science deals with constructing explanations of how things change and how they remain stable. (HS-ESS2-7)
* Change and rates of change can be quantified and modeled over very short or very long periods of time. Some system changes are irreversible. (HS-ESS2-1)
AAAS Benchmarks for Science Literacy
Some changes in the earth’s surface are abrupt (such as earthquakes and volcanic eruptions) while other changes happen very slowly (such as uplift and wearing down of mountains). 4C/M2a
Rock bears evidence of the minerals, temperatures, and forces that created it. 4C/M4
Common Core ELA
CCSS.ELA-LITERACY.RST.9-10.1
Cite specific textual evidence to support analysis of science and technical texts, attending to the precise details of explanations or descriptions.
CCSS.ELA-LITERACY.RST.9-10.4
Determine the meaning of symbols, key terms, and other domain-specific words and phrases as they are used in a specific scientific or technical context relevant to grades 9-10 texts and topics.
CCSS.ELA-LITERACY.RST.9-10.5
Analyze the structure of the relationships among concepts in a text, including relationships among key terms
CCSS.ELA-LITERACY.RST.9-10.7
Translate quantitative or technical information expressed in words in a text into visual form (e.g., a table or chart) and translate information expressed visually or mathematically (e.g., in an equation) into words.
CCSS.ELA-LITERACY.RST.9-10.10
By the end of grade 10, read and comprehend science/technical texts in the grades 9-10 text complexity band independently and proficiently.
Super Size Me – science or balderdash
Many students have seen the 2004 documentary “Super Size Me” in a health class. Is this film a fair illustration of the harmful effects of fast food, or is it junk science, misleading, and possibly deceptive?
Super Size Me is directed by and starring Morgan Spurlock. The movie follows a one month period during which he ate only very large portions of McDonald’s food.
“The film documents this lifestyle’s drastic effect on Spurlock’s physical and psychological well-being and explores the fast food industry’s corporate influence, including how it encourages poor nutrition for its own profit.” (Wikipedia)
The most common criticism is that eating fast food doesn’t cause weight gain; in fact several people had demonstrated sustained weight loss while eating a McDonalds-only diet. The weight gain came from deliberate, daily binging.
A deeper criticism is a rejection of his claim that fast food causes liver damage in just one month. In fact, Morgan Spurlock later admitted that he was a lifelong alcoholic, and it is believed that this behavior which caused the liver issues he spoke about at the end of his film.
Ken Hoffman writes
Now comes comedian-writer Tom Naughton with Fat Head, a new documentary that he’s shopping around to distributors. In Fat Head, Naughton plows head first into fast food and doesn’t come up for air for 30 days. It’s similar in premise to Super Size Me and is just as funny but with a very different ending.
Naughton loses 12 pounds (206 to 194) and his cholesterol goes down (231 to 222, which still isn’t good, but better)…
Naughton lost weight stuffing his face with burgers. Basically, he went on a modified Atkins low-carb diet. He ate the burger but tossed most, if not all, of the bun. Unlike Spurlock, Naughton has a page on his Web site that lists every item (including nutritional information) he ate during his fast-food month.
Ordering up some food for thought, Ken Hoffman, Houston Chronicle, 1/15/2008
Soso Whaley showed that if one made reasonable dietary choices then one could eat every day at McDonalds, lose weight, lower one’s cholesterol level, and stay healthy. She writes:
Even without seeing the film I could tell from the clips and the description by Spurlock that this was nothing more than junk science masquerading as legitimate scientific discovery…. Super Size Me should not be allowed to exist without a proper counterpoint to it’s blatant propagandizing and shoddy scientific methodology. Other than that, I wanted to lose ten pounds.”
“…no, McDonald’s isn’t what is considered to be a “politically correct” source of food in our current cultural climate. However, when I was growing up during the 50s and 60s we didn’t have all the tens of thousands of food choices available today. Back then a hamburger or a chicken sandwich was considered a legitimate way to acquire a serving of high-grade protein and grains, add a tomato and some lettuce, maybe a little onion, pour an 8 oz. glass of milk and you have what would be considered a pretty healthy meal, provided you use proper serving sizes.
So from my point of view McDonald’s serves food that is no better or even different than that which I could acquire at the local store or pretty much any other restaurant”
“To be honest this film is not about bucking up McDonald’s, just a close look at what happens when a person engages in a lifestyle which includes common sense and personal responsibility. I understand that these concepts are very scary to those individuals and corporations who rely on our fear and lack of education to make a buck.
It’s time to take a stand against these food cops and health nannies who won’t be happy until we are eating only food approved by a small group of people who claim to have our best interests at heart but whose real agenda seems to be more about scaring people than in truly educating the public. Spurlock is merely an agent of those who would seek to control our lives and limit our choices “for our own good”.”
“Yes, I lost weight and have managed to maintain that loss. The first time I did the diet in April 2004, I lost 10 pounds (going from 175 to 165) and lowered my cholesterol from 237 to 197, a drop of 40 points. I did the diet again in June 2004 and lost another 8 pounds (going from 165 to 157), there was no change in my cholesterol during that time as it remained at around 197. “
Soso, So Good, National Review Interview, 6/3/2005
==========
Bob Carlton writes
Iowa high school science teacher John Cisna weighed 280 pounds and wore a size 51 pants. Then he started eating at McDonalds. Every meal. Every day. For 180 days. By the end of his experiment, Cisna was down to a relatively svelte 220 and could slip into a size 36.
Cisna left it up to his students to plan his daily menus, with the stipulation that he could not eat more than 2,000 calories a day and had to stay within the FDA’s recommended daily allowances for fat, sugar, protein, carbohydrates and other nutrients. A local McDonald’s franchisee agreed to provide the meals.
“Every time we try to throw the fast-food industry under the bus, it enables fat people like me to say, ‘That’s why I’m fat; McDonald’s makes me fat. Burger King makes me fat,'” Cisna said. “But in all those years that I was fat, I hardly ate fast food. I got that way eating from a grocery store, and from restaurants.
“As a science teacher, I would never show ‘Super Size Me’ because when I watched that, I never saw the educational value in that,” Cisna said. “I mean, a guy eats uncontrollable amounts of food, stops exercising, and the whole world is surprised he puts on weight?’
“What I’m not proud about is probably 70 to 80 percent of my colleagues across the United States still show ‘Super Size Me’ in their health class or their biology class. I don’t get it.”
Meet the science teacher who lost 60 pounds eating nothing but McDonald’s three meals a day, Bob Carlton, 8/11/2015, updated 1/13/2019
==========
In the Wall Street Journal, Phelim McAleer writes that some central points of Super Size Me seem to be bogus:
Before the 30-day experiment, he said, he was in a “good spot” healthwise. By the experiment’s end, he reported experiencing fatigue and shakes (trembling, not Shamrock). Most disturbing, and most widely reported, was that he had suffered liver damage.
The New York Times review was headlined “You Want Liver Failure With That?” The doctor examining him during the experiment said the fast food was “pickling his liver” and that it looked like an “alcoholic’s after a binge.”
Fast-forward to December 2017, when Mr. Spurlock issued a #MeToo mea culpa titled “I Am Part of the Problem,” detailing a lifetime of sexual misdeeds. As a result, YouTube dropped its plans to screen his “Super Size Me” sequel, and other broadcasters cut ties. But overlooked in all this was a stunning admission that calls into question the veracity of the original “Super Size Me.”
After blaming his parents for his bad acts, Mr. Spurlock asked: “Is it because I’ve consistently been drinking since the age of 13? I haven’t been sober for more than a week in 30 years.”
Could this be why his liver looked like that of an alcoholic? Were those shakes symptoms of alcohol withdrawal? Mr. Spurlock’s 2017 confession contradicts what he said in his 2004 documentary.
“Any alcohol use?” the doctor asks at the outset. “Now? None,” he replies. In explaining his experiment, he says: “I can only eat things that are for sale over the counter at McDonald’s—water included.”
A Big Mac Attack, or a False Alarm? Phelim McAleer, 5/23/2018, Wall Street Journal
==========
“All Mr. Spurlock demonstrated is that gluttony does not lead to weight loss. We already knew that.”
– Dr. Ruth Kava, ACSH nutrition director
Health Panel: “Supersize Me” Movie Trivializes Obesity, A Serious Problem, American Council on Science and Health, 5/6/2004
==========
Kate Douglas writes
By the end of Spurlock’s McDonald’s binge, the film-maker was a depressed lardball with sagging libido and soaring cholesterol. He had gained 11.1 kilograms, a 13 per cent increase in his body weight, and was on his way to serious liver damage.
In contrast, Karimi had no medical problems. In fact, his cholesterol was lower after a month on the fast food than it had been before he started, and while he had gained 4.6 kilos, half of that was muscle. …
Supersize me’ revisited – under lab conditions, Kate Douglas, New Scientist, 1/2007
Archived versions of that article may be read here:
https://skylertanner.com/2010/04/30/supersize-me-revisted-under-lab-conditions/
https://forum.bodybuilding.com/showthread.php?t=1316711
Learning Standards
2016 Massachusetts Science and Technology/Engineering Standards
Students will be able to:
* apply scientific reasoning, theory, and/or models to link evidence to the claims and assess the extent to which the reasoning and data support the explanation or conclusion;
* respectfully provide and/or receive critiques on scientific arguments by probing reasoning and evidence and challenging ideas and conclusions, and determining what additional information is required to solve contradictions
* evaluate the validity and reliability of and/or synthesize multiple claims, methods, and/or designs that appear in scientific and technical texts or media, verifying the data when possible.
A Framework for K-12 Science Education: Practices, Crosscutting Concepts, and Core Ideas (2012)
Implementation: Curriculum, Instruction, Teacher Development, and Assessment
“Through discussion and reflection, students can come to realize that scientific inquiry embodies a set of values. These values include respect for the importance of logical thinking, precision, open-mindedness, objectivity, skepticism, and a requirement for transparent research procedures and honest reporting of findings.”
Next Generation Science Standards: Science & Engineering Practices
● Ask questions that arise from careful observation of phenomena, or unexpected results, to clarify and/or seek additional information.
● Ask questions that arise from examining models or a theory, to clarify and/or seek additional information and relationships.
● Ask questions to determine relationships, including quantitative relationships, between independent and dependent variables.
● Ask questions to clarify and refine a model, an explanation, or an engineering problem.
● Evaluate a question to determine if it is testable and relevant.
● Ask questions that can be investigated within the scope of the school laboratory, research facilities, or field (e.g., outdoor environment) with available resources and, when appropriate, frame a hypothesis based on a model or theory.
● Ask and/or evaluate questions that challenge the premise(s) of an argument, the interpretation of a data set, or the suitability of the design
Visualizing cells and organelles in 3D
We are used to seeing cells as seen under a microscope. We can focus them on higher or lower layers of the cell, but each individual, focused image is just two dimensional. Yet cells themselves are three dimensional.
For instance, here are cheek cells (nonkeratinized stratified squamous epithelium) at 500x magnification.
Yet many videos and books show beautiful three dimensional images of cells.
How do we know what cells look like in 3D?
We also know about the chemical structure of most molecules within many cells.
When we combine this information with the 3D structure of a cell, we can use computers to accurately simulate what is going on inside cells.
So again we ask, how are we learning the 3D structure of organelles within cells?
Before you read further, let’s make sure we understand this background information:
What are cells?
Organelles, an introduction
Organelles: In more depth
One of the most powerful techniques for looking inside cells is cryo-electron tomography.
This next image is from Cellular and Structural Studies of Eukaryotic Cells by Cryo-Electron Tomography
Diana Kwon writes
cryo-ET [enables] scientists to see biological molecules in their native environments.… Proteins found in cell membranes, in particular, have been of interest, because many of them are important for understanding disease and developing drugs.
… cryo-ET requires an electron microscope and relies on a sample preparation method known as vitrification: the rapid cooling of the water around a sample so that it freezes into a glass-like state, rather than as ice crystals.
Unlike conventional cryo-EM, however, which requires purified samples, investigators can use cryo-ET to capture these molecules in situ.
With cryo-EM, scientists make a 3D image by taking 2D pictures of lots of isolated molecules in different configurations, and merging the results.
With cryo-ET, by contrast, they take multiple snapshots of a single chunk of material, teeming with molecules, from many different angles, allowing the surroundings to be kept intact.
It’s like having a photo of a whole crowd, rather than one person’s headshot. This is why Wolfgang Baumeister, a biophysicist at the Max Planck Institute of Biochemistry in Martinsried, Germany, who is one of the pioneers of the technique, and his colleagues have dubbed it “molecular sociology”.
And this is how proteins live, after all. “Proteins are social — at any given time a protein is in a complex with about ten other proteins,” says Villa. After viewing such interactions with cryo-ET, “I could not stomach the thought of myself studying another protein in isolation,” she adds.
The secret lives of cells — as never seen before. Cutting-edge microscopy techniques are allowing researchers to spy on the innards of cells in all their crowded glory. Diana Kwon, Nature news feature, Oct 26, 2021
https://www.nature.com/articles/d41586-021-02904-w
Video – 3D visualization of a Golgi apparatus. (from green alga cells.)
3d structure of endoplasmic reticulum: helical parking garage
The endoplasmic reticulum is the protein-making factory within cells … tightly stacked sheets of membrane studded with the molecules that make proteins.
Researchers have refined a new microscopy imaging method to visualize exactly how the ER sheets are stacked, revealing that the 3D structure of the sheets resembles a parking garage. This structure allows for the dense packing of ER sheets, maximizing the amount of space available for protein synthesis.
Endoplasmic reticulum: Scientists image ‘parking garage’ helix structure in protein-making factory, Cell Press 7/18/2013
Another beautiful helix for biology, this time reminiscent of a parking garage Eurekalert
Another Beautiful Helix for Biology, This Time Reminiscent of a Parking Garage, U Conn
Here is one of the images from “Stacked endoplasmic reticulum sheets are connected by helicoidal membrane motifs”
Cell, 2013 Jul 18;154(2):285-96. doi: 10.1016/j.cell.2013.06.031.
Here is a 3d model of a part of the ER. The exact shape of course varies from cell to cell; it is not regular, either.
“Stacked Endoplasmic Reticulum Sheets Are Connected by Helicoidal Membrane Motifs” from Cell, Vol. 154 (2), p.285-296, 7/18/2013
Resources
Allen Institute for Cell Science
Allen Institute Simularium: Share, visualize, & interrogate biological simulations online
Integrated mitotic stem cell
Video: The Inner Life of the Cell, from XVIVO Scientific Animation. Commissioned by Harvard University’s Department of Molecular and Cellular Biology
Learning Standards
2016 Massachusetts Science and Technology/Engineering Curriculum Framework
6.MS-LS1-2. Develop and use a model to describe how parts of cells contribute to the cellular functions of obtaining food, water, and other nutrients from its environment,
disposing of wastes, and providing energy for cellular processes.
2006 Massachusetts Science and Technology/Engineering Curriculum Framework
Biology High School Standards: Cells have specific structures and functions that make them distinctive. Processes in a cell can be classified broadly as growth, maintenance, and reproduction.
2.1 Relate cell parts/organelles (plasma membrane, nuclear envelope, nucleus, nucleolus, cytoplasm, mitochondrion, endoplasmic reticulum, Golgi apparatus, lysosome, ribosome, vacuole, cell wall, chloroplast, cytoskeleton, centriole, cilium, flagellum, pseudopod) to their functions. Explain the role of cell membranes as a highly selective barrier (diffusion, osmosis, facilitated diffusion, active transport).
Benchmarks for Science Literacy, AAAS
By the end of the 12th grade, students should know that
- Every cell is covered by a membrane that controls what can enter and leave the cell. 5C/H1a
- In all but quite primitive cells, a complex network of proteins provides organization and shape and, for animal cells, movement. 5C/H1b
- Within the cells are specialized parts for the transport of materials, energy capture and release, protein building, waste disposal, passing information, and even movement. 5C/H2a
Cellular and molecular biology: Cell structure and organization, mitosis, photosynthesis, cellular respiration, enzymes, biosynthesis, biological chemistry
Flight
Let’s investigate airplanes and powered air flight
Pioneers of flight
Sir George Cayley (1773-1857)
English engineer, inventor, and aviator. He is considered “the father of aviation.” In 1799, he set forth the concept of the modern aeroplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control. He identified the four forces which act on a heavier-than-air flying vehicle: weight, lift, drag and thrust.
Modern aeroplane design is based on those discoveries and on the importance of cambered wings, also identified by Cayley. He constructed the first flying model aeroplane and also diagrammed the elements of vertical flight. He also designed the first glider reliably reported to carry a human aloft. He correctly predicted that sustained flight would not occur until a lightweight engine was developed to provide adequate thrust and lift. The Wright brothers acknowledged his importance to the development of aviation.
John Joseph Montgomery (1858-1911)
American inventor, physicist, engineer, and professor. Invention of controlled gliders.
National Soaring Museum article
article from The Pioneers Aviation
article, Early Aviators
Karl Wilhelm Otto Lilienthal (1848-1896)
German pioneer of aviation. Made repeated, successful flights with gliders. Newspapers published photographs of Lilienthal gliding, favourably influencing public and scientific opinion about the possibility of flying machines someday becoming practical. In 1891 he put small engines on the glider wingtips.
Alberto Santos-Dumont (1873 — 1932)
A Brazilian aeronaut, sportsman, inventor. One of the very few people to have contributed significantly to the early development of both lighter-than-air and heavier-than-air aircraft. The heir of a wealthy family of coffee producers, Santos-Dumont dedicated himself to aeronautical study and experimentation in Paris.
He designed, built, and flew the first gasoline-powered dirigible balloons and won the Deutsch Prize in 1901, when he flew around the Eiffel Tower in his airship No. 6, becoming one of the most famous people in the world in the early 20th century.
He then progressed to powered heavier-than-air machines and on 23 October 1906 flew about 60 metres at a height of two to three metres with the fixed-wing 14-Bis (also dubbed the Oiseau de Proie—”bird of prey”) at the Bagatelle Gamefield in Paris, taking off unassisted by an external launch system. Santos-Dumont is a national hero in Brazil, where it is popularly held that he preceded the Wright brothers in demonstrating a practical airplane.
Octave Chanute (1832-1910)
A French-American civil engineer and aviation pioneer. Designed gliders. He provided many budding enthusiasts, including the Wright brothers, with help and advice, and helped to publicize their flying experiments.
William S. Henson & John Stringfellow
“Though they themselves never actually got off the ground, Henson and Stringfellow are remembered today as pioneer strategists who helped convince a skeptical world that the air age was within grasp. Theirs is a story of mechanical genius, foresight and a quest to invent the future.” – Historynet Designed the Ariel (which never flew.)
Samuel Pierpont Langley (1834-1906)
American astronomer, physicist, aviation pioneer. In addition to becoming the third secretary of the Smithsonian Institution, he was also a professor of astronomy and director of the Allegheny Observatory. Attempted to build steam engine powered gliders.
Orville & Wilbur Wright
The Wright brothers – Orville (1871 – 1948) and Wilbur (1867 – 1912) – were American aviation pioneers generally credited with inventing, building, and flying the world’s first successful motor-operated airplane. They made the first controlled, sustained flight of a powered, heavier-than-air aircraft with the Wright Flyer on December 17, 1903. They were the first to invent aircraft controls that made fixed-wing powered flight possible.
How do airplanes fly?
How do airplanes fly? And for that matter, how do sharks swim through water? Both are objects moving through a fluid (both air and water are fluids.)
Although flight indeed is in accord with the laws of physics, the specific ideas about how this happens are incomplete. Let’s look at this here – How do airplanes fly?
There are four forces which act on a heavier-than-air flying vehicle: weight, lift, drag and thrust.
NASA Four Forces on an airplane, Glenn Research Center
Lift, Thrust, Weight, and Drag av8n.com
The graveyard spiral
An infamous, dangerous spiral dive that can be entered into accidentally by a pilot. See The graveyard spiral

Graveyard spiral diagram from Figure 16-5 of the Federal Aviation Administration handbook, “Pilot’s Handbook of Aeronautical Knowledge”, 2008 edition
Breaking the sound barrier
A vapor cone is a visible cloud which can sometimes form around an object moving at high speed. See Vapor cones and mach cones.
Build your own hovercraft
A hovercraft is an amphibious craft capable of travelling over any surfaces. One can build a model, working hovercraft – Hovercraft build DIY.
Apps & interactives
Fluid dynamics and the Bernoulli equation, app from oPhysics
Bernoulli lab, app from thephysicsaviary

image from http://www.thaitechnics.com
Flight Dynamics 3D WebGL Gimbal JS Model: Flight Dynamics 3D WebGL Gimbal Model Source Code – Simulate the effect of yaw, pitch, and roll
Physlet One-Dimensional Kinematics Problems Package: Prob 2.3: Matching Helicopter Flight – Varying helicopter flight paths are given in the animations.
Flight Dynamics Gimbal JavaScript HTML5 Applet Simulation Model
Flight Dynamics Gimbal JavaScript HTML5 Applet Simulation Model
Resources
WhiteBox Learning is STEM learning for Engineering, Science, and Technology Education classrooms, grades 6-12. Completely web-based, students can design, analyze, and simulate their designs from a web browser, and compete with other students throughout their district.
How Things Fly website is a companion to the physical exhibition at the Smithsonian National Air and Space Museum.
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Golf balls, moon phases, and geometry oh my
You know about the phases of the moon, right? They are how the moon appears – which parts are light and which are dark. They are seen from the perspective of someone looking up from Earth, into space, at the moon.
Don Hass, from the Paleontological Research Institution and its Museum of the Earth, has this special treat for us!
If you hold a ball and line it up with the moon when it’s out during daylight, the ball will be in the same phase as the moon!
That’s because the geometry of the moon-Earth-sun system is the same as the geometry of the ball-eye-sun system.
Don writes
When’s the next ‘full’ Titleist? It’s complicated! The next full moon is November 19, but as we go into these days of fewer daylight hours, you won’t see a full moon during daylight, so this trick won’t work with a full moon, I think, until spring.
Here’s the set up. I laid down next to the table to get the shot.
On a related note, we have this from https://flatearth.ws/
Some related articles
Earth-Moon system
Moons – What exactly is a moon?
Why are some moons spherical while others are shaped like potatoes?
How many moons does Earth have?
Lunar motions (Libration, axial precession, apsidal precession, nodal precession
Yes, geometry can be useful in real life and in careers!
Seafloor and seafloor mapping
The seabed, or seafloor, is the bottom of the ocean.
It’s structure is governed by plate tectonics.
Most of the ocean is very deep, where the seabed is known as the abyssal plain.
Seafloor spreading creates mid-ocean ridges along the center line of major ocean basins, where the seabed is slightly shallower than the surrounding abyssal plain.
From the abyssal plain, the seabed slopes upward toward the continents.
It becomes, in order from deep to shallow, the continental rise, slope, and shelf.
The depth within the seabed itself, such as the depth down through a sediment core, is known as the “depth below seafloor.”
The ecological environment of the seabed and the deepest waters are collectively known, as a habitat for creatures, as the “benthos.”
Most of the seabed throughout the world’s oceans is covered in layers of sediments. Categorized by where the materials come from or composition, these sediments are classified as either: from land (terrigenous), from biological organisms (biogenous), from chemical reactions (hydrogenous), and from space (cosmogenous).
Categorized by size, these sediments range from very small particles called clays and silts, known as mud, to larger particles from sand to boulders.
Seafloor mapping
The measurement of depth of a given body of water.
Bathymetric measurements are conducted with various methods, from sonar and Lidar techniques to buoys and satellite altimetry.
Various methods have advantages and disadvantages. The specific method used depends upon the scale of the area under study, financial means, desired measurement accuracy, and additional variables.
The earliest methods of depth measurement on record are the use of sounding poles and weighted lines, recorded from Egypt more than 3000 years ago.
These methods were in use without significant improvement until the voyage of HMS Challenger in the 1870s, when similar systems using wires and a winch were used for measuring much greater depths than previously possible, but this remained a one depth at a time procedure which required very low speed for accuracy.
At the beginning of the twentieth century mapping the seafloor was a very difficult task. The mapping of the sea floor started by using sound waves, contoured into isobaths and early bathymetric charts of shelf topography. These provided the first insight into seafloor morphology, though mistakes were made due to horizontal positional accuracy and imprecise depths.
In 1957, Marie Tharp, working alongside with Bruce Charles Heezen created the first three-dimensional physiographic map of the world’s ocean basins.
This next image from seafloor spreading.
Despite modern computer-based research, the ocean seabed in many locations is less measured than the topography of Mars.
Wikibooks, high School Earth Science
Water on Earth
Seafloor spreading
Local seafloor conditions
The ocean floor off of Massachusetts.
The seafloor off of New York State
Image from Topography, shaded relief, and backscatter intensity of the Hudson Shelf Valley

USGS Open-File Report 03-372, Topography, shaded relief, and backscatter intensity of the Hudson Shelf Valley, offshore of New York
Marie Tharp
Marie Tharp’s pioneering contributions to seafloor mapping helped reveal Earth’s submarine landscape in unprecedented detail. Although her findings were initially dismissed as “girl talk,” her work ultimately played an essential role in the acceptance of the theory of plate tectonics.
Join Us in Celebrating #MarieTharp100

Image: Lamont-Doherty Earth Observatory and the estate of Marie Tharp
Introduction to Oceanography
By Paul Webb. This book covers the fundamental geological, chemical, physical and biological processes in the ocean, with an emphasis on the North Atlantic region.
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Chapter 1: Introduction to the Oceans
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Chapter 2: Getting our Bearings
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Chapter 3: The Origin and Structure of Earth
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Chapter 4: Plate Tectonics and Marine Geology
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Chapter 5: Chemical Oceanography
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Chapter 6: Physical Oceanography
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Chapter 7: Primary Production
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Chapter 8: Oceans and Climate
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Chapter 9: Ocean Circulation
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Chapter 10: Waves
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Chapter 11: Tides
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Chapter 12: Ocean Sediments
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Chapter 13: Coastal Oceanography
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Chapter 14: Ice
Introduction to Oceanography by Paul Webb is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.
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Iberian, Spanish, Latino, Hispanic – Terminology
During National Hispanic American Heritage Month questions may arise from students and teachers – who is included as Hispanic?
The question of what term to use is found in many articles. Vanessa Romo on NPR writes
As the headline unambiguously states, here at NPR we’ve kicked off Hispanic Heritage Month. Not Latino Heritage Month. Not Latinx Heritage Month. Not even a compromise or a combination of the three: Hispanic/Latino/ Latinx Heritage Month… it’s not too late to pose the following thorny questions: What’s the harm in lumping together roughly 62 million people with complex identities under a single umbrella? Is a blanket pan-ethnic term necessary to unite and reflect a shared culture that is still largely (infuriatingly) excluded from mainstream popular culture? Or the more basic question: ¿Por que Hispanic?
Yes, We’re Calling It Hispanic Heritage Month And We Know It Makes Some Of You Cringe by Vanessa Romo on NPR, 9/17/2021
Here we discuss these different terms and how they are used.
Iberian – The origin of Hispanic, Latin, etc.
The Spanish and Portuguese peoples originate from the Iberian peninsula. This is a peninsula in the southwest corner of Europe.
People from Spain refer to themselves as Spanish.
People from Portugal refer to themselves as Lusitanians or Portuguese.
Both Spanish and Portuguese people can be referred to as Iberians; Spanish and Portuguese who have moved to the United States may refer to themselves as Iberian-Americans.
Sure, this peninsula is mostly divided between Spain and Portugal. But small amount of this peninsula includes
• a small area of Southern France
• Andorra (a sovereign landlocked microstate)
• Gibraltar (a tiny, self-governing British overseas territory. Technically part of the United Kingdom.)
Americans often see the Iberian peninsula as being synonymous with Spain, but there is a diversity of ethnic and linguistic groups. This next image is from Iberia’s children: A short history of why Portuguese and Spanish are different.
Debate on names and identities
Let’s look at Latinos or Hispanics? A Debate About Identity, by Darryl Fears, Washington Post, August 25, 2003
That declaration — “I’m a Latina” — is resounding more and more through the vast and diverse Spanish-speaking population that dethroned African Americans as the nation’s largest ethnic group a few months ago.
It is also deepening a somewhat hidden but contentious debate over how the group should identify itself — as Hispanics or Latinos. The debate is increasingly popping up wherever Spanish speakers gather.
It was raised last month at the National Council of La Raza’s convention in Austin. The Internet is littered with articles and position papers on the issue. Civic organizations with Hispanic in their titles have withstood revolts by activist members seeking to replace it with the word Latino.
Cisneros refused to appear on the cover of Hispanic magazine earlier this year because of its name. She relented only after editors allowed her to wear a huge faux tattoo on her biceps that read “Pura Latina,” or Pure Latina.
Another Mexican American writer, Luis J. Rodriguez, only reluctantly accepted an award from a Hispanic organization “because I’m not Hispanic,” he said.
…. Although the terms Latino and Hispanic have been used interchangeably for decades, experts who have studied their meanings say the words trace the original bloodlines of Spanish speakers to different populations in opposite parts of the world.
Hispanics derive from the mostly white Iberian peninsula that includes Spain and Portugal, while Latinos are descended from the brown indigenous Indians of the Americas south of the United States and in the Caribbean, conquered by Spain centuries ago.
Latino-Hispanic is an ethnic category in which people can be of any race. They are white, like the Mexican American boxer Oscar de la Hoya, and black, like the Dominican baseball slugger Sammy Sosa.
… Duard Bradshaw has a different opinion. “I’ll tell you why I like the word Hispanic,” said the Panamanian president of the Hispanic National Bar Association. “If we use the word Latino, it excludes the Iberian peninsula and the Spaniards. The Iberian peninsula is where we came from. We all have that little thread that’s from Spain.”
A survey of the community conducted last year by the Pew Hispanic Center of Washington found that nearly all people from Spanish-speaking backgrounds identify themselves primarily by their place of national origin.
When asked to describe the wider community, more than half, 53 percent, said both Hispanic and Latino define them. A substantial but smaller group, 34 percent, favored the term Hispanic. The smallest group, 13 percent, said they preferred Latino. A survey by Hispanic Trends magazine produced a similar finding.
…Mexican American activists in California and Puerto Rican activists in New York were not pleased. They favored a term that included the brown indigenous Indians who they believe are the source of their bloodline.
“Hispanic doesn’t work for me because it’s about people from Spain,” said Rodriguez, author of the book “The Republic of East L.A.” “I’m Mexican, and we were conquered by people from Spain, so it’s kind of an insult.” Rodriguez’s views are typical of Mexican Americans in Los Angeles, the epicenter of immigrants from that country, and the Chicano rights movement.
Some tentative definitions: Hispanic, Latino, Spanish
Spanish – someone from Spain.
Portuguese – someone from Portugal.
Hispanic – people from or with ancestors from, Spanish speaking countries, e.g. Spain, Mexico, Central America and South America.
Brazilians are not considered Hispanic because they speak Portuguese.
Latino – People from, or who have ancestors from, Latin America which includes Mexico, Central America and South America.
In this case, Brazilians are considered Latino, but people from Spain are not.
Chicano – Mexican Americans.
From the Rice & Frijoles social media page we have this suggestion.
This next infographic is similar, but we immediately see a different: This group believes that the term Hispanic should include people from Spain, and does not suggest “Spanish” as an independent, alternate name.
This image is from Clarifying Terms for Hispanic Heritage Month.
Chicano
Neither of these infographics mention “Chicano.” Chicano or Chicana is a chosen identity for many Mexican Americans in the United States. It is often used interchangeably with Mexican American.
While Mexican-American identity emerged to encourage assimilation into White American society and separate the community from African-American political struggle, Chicano identity emerged among anti-assimilationist youth, some of whom belonged to the Pachuco subculture, who claimed the term (which had previously been a classist and racist slur.)
Chicano was widely reclaimed in the 1960s and 1970s to express political empowerment, ethnic solidarity, and pride in being of Indigenous descent (with many using the Nahuatl language as a symbol), diverging from the more assimilationist Mexican American identity.
Chicano youth in barrios rejected cultural assimilation into whiteness and embraced their identity and worldview as a form of empowerment and resistance.
In the Boston area
The following is from the Norman B. Leventhal Map & Education Center at the Boston Public Library.
While Hispanic Heritage Month is widely construed as a time to celebrate individuals of Latin American heritage in the U.S, the term “Hispanic” actually has a more specific definition.
Hispanic refers to any individual who speaks Spanish. This definition includes a significant portion of Hispanic Americans who don’t share Latin American (and/or Latino, Latinx, Latine) identity, such as individuals from Spain or the Republic of Equatorial Guinea.
Conversely, the phrasing of Hispanic Heritage excludes those with Latin American heritage who do not speak Spanish, including individuals with ancestry in Brazil, Haiti, and Belize.
While the most widely spoken non-English language in the greater Boston area is Spanish, much of Boston’s language diversity is found in non-Spanish speaking Latine communities. As you can observe when comparing these two maps, some of Boston’s most diverse neighborhoods in terms of languages spoken are areas where Spanish speaking communities border and coexist with French Creole and Portuguese speaking communities.
Map 1: Boston neighborhoods colored differently to indicate different non-English languages spoken by 10% or greater of the population. Boston Planning and Development Agency, “Boston’s top 5 foreign languages spoken at home, 2015” (2017)
Map 2: Boston neighborhoods colored in to show percentages of language diversity. Boston Planning and Development Agency, “Boston’s diversity index, 2010: measures of diversity: language other then English spoken at home” (2014)
Articles
Latinx, Latine, Hispanic, Latino/a: What Do We Call Ourselves? Laysha Macedo, HipLatina, 10/13/2021
“Terminology is tricky to denounce or uphold. For example, “Hispanic” is an outdated, colonizer label but that doesn’t stop older generations from using them to identify themselves and others. Latinx, in particular, is a term that means something different depending on the person. As we’ve seen on social media and even in discourse held in our own kitchen tables, there is a strong distaste for it so much so that “Hispanic” is still preferred despite the ties to colonization…
“Hispanic” versus “Latino” versus “Latin”, Hispanic Economics
Is it Hispanic, Chicano/Chicana, Latino/Latina, or Latinx?, GENIAL: Latinas
Generating Engagement and New Initiatives for All Latinos
The Next Dust Bowl? Lake Powell and Lake Mead
The Dust Bowl was a period of severe dust storms that greatly damaged the ecology and agriculture of the American and Canadian prairies during the 1930s.
Could something like this happen again here in the USA?
In this unit we’ll take a look at places here in the United States, Lake Powell and Lake Mead.
Let’s start by using this map to put us in geographical perspective.
Geography and population
Open a new Google Doc for thus unit. Title it The Next Dust Bowl? Lake Powell and Lake Mead.
Answer the questions below in this document. Share it with your teacher.
1. In what states do we find these lakes?
2. What river connects these two lakes?
3. What canyon lies in between these two lakes?
4. What major city is shown on this map (and which relies on this water)?
5. What we think of as Les Vegas is actually only a smaller part of a larger metropolitan areas, the Las Vegas Valley. What is the population of this area?
Use Las Vegas Valley to find the answer.
6. How many people, overall, depend on water from this Lake Powell/Lake Mead water system? Scroll through this till you find “rely on water from Lake Mead” – Lake Mead, National Park Service
Reading and analysis
1. Use Google Maps to find out where in the USA these lakes are, relative to the borders of the continental United States. Point them out.
2. Zoom in on the maps to show the position of these lakes relative to the states that they are in, showing the borders of the nearby states.
3. Go here: Lake Powell Reaches New Low, Earth Observatory, NASA
4. Use the interactive slider on these photos. What do we observe? Please describe in some detail.
5. We read “After two years of intense drought and two decades of long-term drought in the American Southwest, government water managers have been forced to reconsider how supplies will be portioned out in the 2022 water year.”
Let’s click the link to the referenced article:
Large contribution from anthropogenic warming to an emerging North American megadrought
By A. Park Willians et al. Science, 17 Apr 2020, Vol 368, Issue 6488, pp. 314-318
Together, let’s read and discuss the abstract here. We’ll figure out the terminology and understand the main idea.
6. Click back to our main article (“Lake Powell Reaches New Low”) Look at the graph showing water levels in the lake from 1999 to 2021. What is the main point here?
7. What do experts expect to see here over the next five years?
8. Why is the Colorado River basin so important?
9. Go here: Earth Observatory, NASA
Lake Mead drops to a record low
10. Use the interactive slider on these photos. What do we observe? Please describe in some detail.
11. Look at the graph showing water levels in the lake from 2000 to 2021. What is the main point here?
Related article
First-Ever Colorado River Water Shortage Declaration Spurs Water Cuts in the Southwest
Pitfalls on Multicultural Science Education
This classic essay is from Emeritus Professor Bernard Ortiz de Montellano. Wayne State University, Anthropology.
I have been appointed to a State Department of Education committee to recommend materials that could be used to train teachers on including gender and multiculturalism in teaching science. At the first meeting, one of the members who works at a gender and equity program at the U, of Michigan passed around one of their publications that included claims about the Dogon, the usual post-modernist critique of “Western science,” and recommended Aronowitz and Helen Longino for theory.
I prepared the following to try to educate the members of the committee, who are primarily out of education rather than science. It is short, elementary, and covers too much. Please keep that in mind and the intended audience when you critique it.
Bernard
Comments on Pitfalls on Multicultural Science Education
Bernard Ortiz de Montellano
Anthropology Department
Wayne State University
As a group that is going to be in charge of recommending materials for the instruction of teachers on how to best introduce gender and equity considerations we need to be clear about what is valid science and what is not. I was concerned at our first meeting when materials were distributed that included a reference bibliography and a critique of “Western” science that are very troublesome.
Every member of the committee should read Higher Superstition [Gross, P. R. and N. Levitt. 1994. Higher Superstition. The Academic Left and its Quarrels with Science. Baltimore: Johns Hopkins Univ. Press.], but in its stead I have prepared this brief paper for our consideration.
First, we need to get a fuller sample of what the multicultural-post-modernist claims that are being made are. Hunter Havelin Adams is the author of the Portland Baseline Essay in Science that is widely used including in the Detroit School District and was quoted in the University of Michigan publication distributed here.
What follows comes from his article in Blacks in Science [Adams, H. H. 1983. “African Observers of the Universe: The Sirius Question.: In Ivan Van Sertima, ed. Blacks in Science. Ancient and Modern. 27-46. New Brunswick: Transaction Books.]
p. 31 “[Citing Carl Spight on the tenets of Western science]:
1. science is fundamentally, culturally independent and universal.
2. The only reliable and completely objective language is scientific knowledge.
3. Science is dispassionate, unemotional, and anti-religious.
4. Logic is the fundamental tool of science.
5. The scientific method leads systematically and progressively toward the truth.
[This is a straw-man as we will see below]
… (citing Wade Nobles) “Science is the formal reconstruction or representation of a people’s shared set of systematic and cumulative ideas, beliefs and knowledge (i.e. common sense) stemming from their culture.”
Thus science cannot always spring from a universal or culturally independent base. It must be consistent with the essentials of its people’s “common sense.”
[B O. de M.–no scientist would agree with this definition.]
p. 41 “Nobody has a monopoly on truth. There is no one correct way of knowing: there are ways of knowing. And Western conceptual methodology cannot discover any more basic truths to explain the mysteries of creation than can a symbolic/intuitive methodology.”
p. 43 [citing the mystic R. A. Schwaller-Lubicz who characterized Western science as “a research without illumination.”
“…Eastern societies, such as those of India and Africa, do not have this problem because there is no distinct separation between science and religion, philosophy and psychology, history and mythology. All of these are viewed as one reality and are closely interwoven into the fabric of daily life. Astronomers, biologists and physicists are gradually coming around to accepting that there is something transcendental behind the empirical. They are realizing that, despite the exponential increase in information about the universe and about life, they are no closer to the truth they so passionately seek, than when the Greek philosopher Democritus, speculated about the atom 2000 years ago…”
[This is patently ridiculous on its face, do we really know as little about atoms today as Democritus did? In our daily life we can see the results of science and technology at work in real life.]
Before there can be a different science in the West, there first must be a transformation of values: a revolution in paradigms. As Jan Houston director of the foundation for Mind Research,[This a foundation set up by R. Houston to prove the validity of Laetrile as a cure for cancer.] observes, “we may now be in the early stages of a qualitative and quantitative departure from the dominant scientific and social paradigms.” This change may bring science into a more creative dialogue with other ways of knowing, other intuitive models and methodologies which are synthesized with the empirical mode in the science of early blacks. “
“This science was such a synthesis. It was a sacred science, whose fundamental paradigm was based on a spiritual principle: a principle which implicitly acknowledged the existence of One Supreme Consciousness or Force pervading the Universe, expressing itself in an infinite variety of transformations, from atom to stars, from plants to moon.”[This sentence is New Age science babble, mystical, and religious but not science.]
Feminist philosophers of science like Sandra Harding or Helen Longino and critics such as Stanley Aronowitz make similar critiques claiming that science is a set of conventions produced by the particular culture of the West at a particular historical period and not a body of knowledge and testable conjecture concerning the “real” world. The agenda, methodology, and conclusions of science are determined by the interests of the male dominated capitalistic system.
This approach has been called “strong cultural constructivism” by Gross and Levitt. Because science is just a “situated” mode of discourse and not reflective of the real world, other modes of discourse (feminist, African, Aztec) are equally valid “ways” of knowing (including intuition, magic, and religion), and may even be superior to “Western” science.
All of these critiques claim that the advent of quantum physics and particularly of the Heisenberg Uncertainty Principle has created a crisis in science because physics can no longer provide reliable information about the world and science has lost its claim to objectivity. Much is made of Heisenberg, Thomas Kuhn’s, The Structure of Scientific Revolutions, Paul Feyerabend, and Chaos theory.
The first question that arises, is why in the world are we getting into questions of epistemology, quantum mechanics and chaos theory with grade school teachers? As we will see, the valid questions that arise from Heisenberg’s Uncertainty Principle have little to do with the types of topics dealt or the level of presentation in K-8 or even K-12.
Henry Bauer [Bauer, H. H. 1992. Scientific Literacy and the Myth of the Scientific Method. Urbana: Univ. of Illinois Press.] makes a very useful distinction between “Frontier Science” which is necessarily volatile, unstable, and proceeds by stages, and “Textbook Science” (such as Kepler’s Laws of Planetary Motion or the Laws of Thermodynamics) which is well established and almost surely correct. In schools we are dealing with “Textbook Science” and it is not in crisis.
In 1927, Werner Heisenberg studying the behavior of electrons concluded that it was not possible to simultaneously know exactly the position and the momentum of an electron. This became known as the Heisenberg Uncertainty Principle. It was certainly important in the development of quantum physics, but it is not an important factor in the daily practice of science except for nuclear physicists. In my fifteen years of research in organic chemistry, I never had to consider the Heisenberg Uncertainty Principle in planning or interpreting my results.
A somewhat simplified explanation is that Heisenberg is only important in the case of very small particles (atoms and smaller) that are moving very fast. The uncertainty in these cases comes from the fact that the size of the instrument (let’s assume a photon of light) used to try to determine the position of an electron is in the range of the electron itself. The moment the photon hits the electron to determine its location; the collision of the photon pushes the electron changing its momentum.
Thus another name for the Heisenberg Uncertainty Principle is the “observer effect.” Imagine trying to determine the position of billiard balls on the table using the cue ball as an instrument.
However, when we are dealing with the kind of experiments or sizes that teachers and students would be dealing with there is no problem (and no crisis). A photographer could take a strobe photograph of a baseball pitch in the World Series and we would be able to calculate both its momentum and position at any time accurately even though it is “being observed” by countless photons and thousands of observers.
The reason is that the mass of baseball is enormous compared to the mass of the photons and they bounce off without changing it motion. Similarly, the uncertainty about the location of the desk in your classroom is zero because it is not moving and therefore its momentum is zero.
The Uncertainty Principle has been a victim of the suggestive nature of its name, of physicists dabbling in philosophy, and of English professors who are illiterate in science.
Gross and Levitt (p. 51-52) provide an appropriate summary.
“Once obscurantism has been stripped away, we recognize that the uncertainty principle is a tenet of physics, a predictive law about the behavior of concrete phenomena that can be tested and confirmed like other physical principles.”
“It is not some brooding metaphysical dictum about the Knower versus the Known, but rather a straightforward statement, mathematically quite simple, concerning the way in which the statistical outcomes of repeated observations of various phenomena must be interrelated. And, indeed, it has been triumphantly confirmed.”
“It has been verified as fully and irrefutably as is possible for an empirical proposition. In other words, when viewed as a law of physics, the uncertainty principle is a very certain term indeed. It is an objective truth about the world (If that were not so, there would never have been so much fuss about it).”
Similarly, post-modernists make much of Thomas Kuhn and Paul Feyerabend, but again they are off the mark. Kuhn [Kuhn, T. S. 1970. The Structure of Scientific Revolutions. 2nd ed. Chicago: Univ. of Chicago Press,] described the process by which a “normal” science paradigm (a commonly held theory of a group scientists and an exemplar about how to solve scientific puzzles) becomes increasingly unable to explain observations.
A “revolution” occurs by which it is replaced by a new paradigm, which in turn is accepted by the scientific community and becomes a new “normal” science.
The most recent example would be the replacement of the classical physics of the 19th century by quantum physics. Several points need to be made. A paradigm is not just discarded or overthrown; it is replaced by a paradigm that has wider explanatory powers. A scientific revolution does not change the fundamental characteristics of science as described below. Quantum mechanics still functions in the natural world without supernatural explanations; it still uses the experimental method; makes predictions and attempts to verify them; and depends on acceptance by the scientific community.
Kuhn, in a postscript to his 2nd edition, diplomatically pointed out that his concept had been extended to social sciences and to the humanities but that,
“the sciences, at least after a certain point in their development, progress in a way that other fields do not… Consider, for example, the reiterated emphasis, above, on the relative scarcity of competing schools in the developed science. Or remember my remarks about the extent to which members of a given scientific community provide the only audience and only judges of that community’s work (pp. 208-209).”
Kuhn [Kuhn, T. S. 1977. The Essential Tension. Chicago: Univ. of Chicago Press, p. 312.] also points out the characteristics that both an existing normal science paradigm and one that is proposed as a replacement must meet.
“First, a theory must be accurate: within its domain, that is consequences deducible from a theory should be in demonstrated agreement with the results of existing experiments and observations. Second, a theory should be consistent, not only internally or with itself, but also with other currently acceptable theories applicable to related aspects of nature.”
“Third, it should have broad scope: in particular, a theory’s consequences should extend far beyond the particular observations, laws, and subtheories it was initially designed to explain. Fourth, and closely related, it should be simple, bringing order to phenomena that, in its absence would be individually isolated, and as a set, confuse.”
“Fifth– a somewhat less standard item, but one of special importance to actual scientific decisions– a theory should be fruitful of new research findings: it should, that is, disclose new phenomena or previously unnoted relationships among those already known.”
This certainly does not support the idea that new “scientific” paradigms would include “symbolic\ intuitive methodologies” or religion.
Paul Feyerabend, who is quoted almost as much as Kuhn by post-modernist critics of science, and whose work eventually led to the cultural constructivist view of science now feels that things have gone too far.
“How can an enterprise [science] depend on culture in so many ways, and yet produce such solid results? Most answers to this question are either incomplete or incoherent. Physicists take facts for granted. Movements that view quantum mechanics as a turning point in thought– and that include fly-by-night mystics, prophets of a New Age, and relativists of all sorts– get aroused by the cultural component and forget predictions and technology.”
[Feyerabend, P. 1992. “Atoms and Conscience,” Common Knowledge 1(#1): 157-168.]
That is, we have to remember that science makes predictions that can be verified, and further that we have evidence in our daily lives that science works.
Science is not independent of culture, but we must define and explore what that implies and distinguish it from the post-modern definition.
[Much of what follows comes from Gross and Levitt, pp. 43-45.]
It is clear that certain kinds of research get more encouragement (funding, prestige, recognition) in society depending on perceived priorities. For example, cancer, AIDS, and high temperature superconductivity are high scientific priorities both because they are scientifically interesting and because they are clearly important to society. In this sense it is clear that “Western” science is influenced by culture. It is also clear than in the past science was dominated by white males and excluded and discouraged women and minorities, and that, to a large extent, this continues to be the pattern.
This is clearly an egregious fault, and feminist and minority critiques are justified in this aspect of science. It may well be that, if many more minorities and women became scientists, the agenda and the problems considered interesting and important in science would change. However, critics of science have not provided a clear and specific list of what these different scientific priorities would be, but it could be done. Clearly science is culturally dependent in this sense.
At another level, called “weak cultural constructivism” by Gross and Levitt, it is claimed that scientific debate and how one paradigm is chosen over another is to some degree influenced by social, political, or ideological preconceptions.
For example, Stephen J. Gould [Gould, S. J. 1992. “The Confusion over Evolution,” New York Review of Books, November 19: 47-54.] has argued that Darwin’s view of sexual selection as an important evolutionary mechanism was slow to win acceptance because it went against the Victorian prejudice, that females are by nature passive and lack enough energy to choose mates as Darwin’s extended-model required.
These ideas are reasonable in principle, but the areas of science in which such direct intrusion of ideology is possible are few, and primarily in the life sciences. In this sense, also, “Western” science is culturally constructed.
However, Adams, Aronowitz, Harding and others claim that the very methods (logical\experimental) of science and the answers it gets are “culturally constructed.” This is not acceptable.
The base sequence of a DNA will be the same regardless of the culture of the person performing the analysis.
The trajectory and momentum of a rocket will not change with the amount of testosterone in the blood or the amount of melanin in the skin of the scientist in charge.
The Second Law of Thermodynamics does not have a supernatural component.
It is not true that science is unemotional and does not use intuition.
The process of formulating hypotheses and questions to be investigated is described by physicist J. T. Davies [Davies, J, T. 1973. The Scientific approach, NY: Academic Press, p. 12.] as ” [it] comes from an intuitive leap of the imagination, from inspiration, from induction, or from a conjecture.”
Jacob Bronowski [Bronowski, J. 1956. Science and Human Values. New York: Harper & Row, pp. 27, 35.] compares the creativity of artists and scientists as “finding unity in diversity.”
It took a leap of the imagination for Copernicus to ask himself, “What would the solar system look like if I stood on the sun as the center?”; or for Newton to ask, “what would be the effect if the attraction, that makes the apple fall to the ground, extended out beyond the solar system?”
Popper [Popper, K. R., 1959 The Logic of Scientific Discovery. New York: Basic Books, p. 32.] cites Einstein on “the search for those highly universal laws from which a picture of the world can be obtained by pure deduction.”
“There is no logical path,” Einstein says, “leading to… these laws. They can only be reached by intuition, based upon something like an intellectual love (“Einfuhlung”) of the objects of experience.”
The difference with pseudoscience or with non- science is that a scientist will then take the next steps which are to see what predictions result from the hypotheses and attempt to verify or falsify those predictions in the real world, whereas other “ways” of knowing will not continue the sequence.
Why do Afrocentrists espouse “strong cultural constructivist” critiques of science. In my opinion, it comes from a misguided need to inflate the achievements of ancient Egyptians or Africans. If “other ways” of knowing including magic, are equal or superior to “Western” science, because they both are “culturally constructed modes of discourse” and “Western” science is in crisis, then ancient Egypt can be proclaimed to be equal or superior to modern science.
What must be made clear is the difference between magic, religion, and science. Malinowski [Malinowski, B. 1954. Magic, Science, and Religion. New York: Doubleday Anchor, pp. 1-87.] provided a useful distinction for our purposes. Both science and magic are attempts to control the world, but they differ in that science only deals with the natural world and natural causes while magic recognizes both natural and supernatural causes.
Religion resembles magic in recognizing the existence of the supernatural, and differs from both magic and science in that the role of humans is that of suppliants rather than actors. Non-Western societies and the West until approximately 1500 do not make a distinction between magic, science, and religion.
A crucial step was the gradual separation of science from religion and magic between 1500 and 1700, i.e. the Scientific Revolution. Before this revolution, the hand of God was seen in all the operations of the Universe, and after it, the operations on the universe became subject to natural forces, and God became the ultimate cause setting these forces into motion. God established the physical laws and then stepped out of the way.
[Marks, J. 1995. Human Biodiversity. Genes, Race, and History. New York: Aldine de Gruyter, p. 228-230.]
Contrary to Adams science is not anti-religion. It is areligious. There are other “ways” of knowledge, but they are not science. They function in other important areas where science has nothing to say.
Science has nothing to say about religion, about forms of government, about ethics, about standards of beauty, or about the ultimate causes of the universe. Science can talk about the evolution of humans but not about why or for what purpose we are here.
This separation of science and the supernatural is crucial and a defining characteristic of science.
The key question is whether children in public schools are going to be taught that religion (under the guise of “Egyptian science”) equals science. This is the same question which was roundly forbidden by both lower courts and the United States Supreme Court in the case of so-called “scientific creationism.”
The essence of the decision of Judge Overton in McLean vs. Arkansas [McLean vs. Arkansas Board Of Education. 1982. “Creationism in the Schools: The Decision in McLean versus the Arkansas Board of Education.” Science 215: 934-943.] was that science does not allow an appeal to the supernatural for explanations. He outlined the essential characteristic of science as:
(1) It is guided by natural law;
(2) It has to be explanatory by reference to natural law;
(3) It is testable against the empirical world;
(4) Its conclusions are tentative; i.e., are not necessarily the final word;
and (5) It is falsifiable.
It is perfectly feasible to teach what I call “culturally relevant” science. The Arabs, the Egyptians, the Chinese, the Aztecs, American Indians, the peoples of Africa, and other non- Western peoples all have agricultural practices, mathematics, and technology that can be used to teach science and to illustrate scientific principles. All that has to be done is to strip away the religious motivation. Religion in the past was a powerful motive to seek knowledge. Newton’s motivation for much of his work was his deep religious conviction that he cold glorify God by showing the beauty and harmony of the arrangements in the cosmos. What distinguished Newton is that he did not invoke supernatural explanations for his work in optics and mechanics.
Similarly, the motivation for the Maya intensive study of the skies was their religious conviction that they had to be able to predict astronomical events in order to survive and prosper. I teach Maya religion as social studies. Maya astronomical, calendric, and mathematical achievements can be taught as science separate from the motivation that impelled them just as we study Newton’s mechanics with no concern for his deep religious motivation.
We are now ready to propose a definition of science that is different that the straw man set up by Adams which may reflect perception of the layperson. Science does not claim to be the ultimate, or the final truth. Science is both a special kind of information and a method.
Strahler [Strahler, A. N. 1992. Understanding Science. Buffalo: Prometheus Books, pp. 27-28.] defines it thus,
“Scientific knowledge: the best picture of the real world that humans can devise, given the present state of our collective investigative capability. By “best” we mean (a) the fullest and most complete description of what we observe, (b) the most satisfactory explanation of what is observed in terms of interrelatedness to other phenomena and to basic or universal laws, and (c) description and explanation that carry the greatest probability of being a true picture of the real world… “
“scientific knowledge is imperfect and must be continually restudied, modified and corrected it will never reach static perfection. Scientific method: the method or system by which scientific knowledge is secured. It is designed to minimize the commission of observational errors and mistakes of interpretation. The method uses a complex system of checks and balances to offset many expressions of human weakness, including self-deception, narrowness of vision, defective logic, and selfish motivation.”
To this must be added the scientific community; the worldwide group of people engaged in science. This community is a key component of the scientific method because it is what serves as the self-correcting and error minimizing component.
The prevailing ethic is honesty as Bronowski [Bronowski, 1956, pp. 65-94.] put it “We OUGHT to act in such a way that what is true can be verified to be so.”
Truth in science is particularly truth in the process of carrying out research. The scientific community will attempt to verify claims, hypotheses, and observations made by others, and therefore the ethic in science is for members of the community to be independent, and original in thought and to communicate fully and openly.
The more important or unexpected the faster and more thoroughly will the claim be investigated. The recent case of cold fusion is a good example of the speed with which a claim can be falsified when it is both unexpected and potentially very important. As in all human institutions, there will be scientists who will fail to act according to the ideal, but to a greater extent than other professions, violation of standards such as honest reporting of data will lead to professional death.
The scientific community is worldwide, and includes Chinese, Japanese, Nigerians, Egyptians, Argentineans, people of all races, ethnic groups, and sexes. Anyone can become a member by agreeing to function according to he same ethos and approach.
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By Bernard Ortiz de Montellano. This was originally published on bit.listserv.skeptic in March 1995, and directed at teachers nationwide.
Articles on academia.edu, Articles on Google Scholar, Articles on Skeptical Inquirer
Topics: History, pseudohistory, archaeology, pseudoarchaeology, skeptic
Rotating space stations with counter rotating segments
Big idea: Building a rotating space station with artificial gravity isn’t a far-out sci-fi idea. The idea has its roots in firm, realistic engineering & science.
Let’s start here Rotating space stations in fact and science fiction.
This is an image of a Rotating O’Neill cylinder space station, see the animation here.

Next we see a fictional space ship from the classic sci-fi TV series, Babylon 5. This is an Omega class destroyer. As you can see, the main engines are in back as one would imagine in a typical spaceship.
When the main engines are not on there is no acceleration, so everyone inside would be in zero-gee. That is why there is a rotating section. People living in the rotating elements far from the axis would feel something like gravity (depending on the diameter of the ship, likely only a small fraction, such as 025 gee.
The rotating sections simulate gravity. This would be useful for people spending long periods of time in a spaceship or space stations
Again, above we see an Omega class destroyer from Babylon 5: There is a problem with the spaceship shown above: My friend Albert points out
That ship wouldn’t work unless it had jets on the main hull to stabilize it. There’s nothing holding the rest of the ship “in place”. It would start spinning because of conservation of angular momentum. Same reason you can’t have a helicopter without the back rotor generating thrust.
That’s a great point. I found a discussion of this physics from the people making the show. They knew about this issue. They took time to get most of the science, measurements, and scale correct. But they were producing this show on a weekly basis in the 1990s. Cost and time constraints led them to avoid discussing or showing such details in-show. Be that as it may, the science on Babylon 5 was leaps and bounds ahead of most science fiction TV shows.
But let’s expand on Albert’s point. Are such rotating ships or stations controllable? They have counter-intuitive physics. They can become unstable easily
Consider the tennis racket theorem, aka Dzhanibekov Effect, aka intermediate axis theorem.
See it demonstrated here, with a (you guessed it) tennis racket! Tennis racket theorem GIF demo
It is named after Soviet cosmonaut Vladimir Dzhanibekov who noticed one of the theorem’s logical consequences while in space in 1985 – although the effect was already known for at least 150 years before that.
The theorem describes the following effect: rotation of an object around its first and third principal axes is stable, while rotation around its second principal axis (or intermediate axis) is not.
In many situations spaceships or space stations would demonstrate such behavior.
In theory such motion is completely predictable and deterministic; the motions follow from a standard analysis of classical mechanics. But in practice, a human making the station or ship move wouldn’t be able to do this physics in their head. We might want the ship to speed up and move right, but when thrust is applied this counter-intuitive motion would likely occur.
There are two solutions:
One solution is to use a layer of computer control between the navigator/pilot and the actual thrusters. The pilot inputs the path desired, and the computer works backward from the desired path, figuring out which directions thrust should be applied (and which ways gyroscopes should be spun)
Another solution is to have two separate rotating sections, aka counter rotation. This reduces the likelihood of counterintuitive motion and makes it easier for a human to engage in manual control. It increases the stability of the design overall.
This is the same reason that helicopters have two counterrotating rotors.
This does introduce some engineering costs. Torsional stresses exist at every place where sections rotate. So two such sections would double the maintenance and associated costs.
Here is an example of a hypothetical rotating space station with counterrotating rings. This GIF from a Reddit user at Reddit Kerbal Space Program
One of the science folks I spoke with pointed out:
Now, one would think that such a centrifuge would act as a titanic gyroscope, doing its best to prevent the ship from changing its orientation.
The obvious solution is to have two counter-rotating centrifuges, so their torque cancels out. Just like contra-rotating propellers on an airplane.
Alternatively you can use one centrifuge plus a monstrous counter-rotating flywheel with the same mass.
Aerospace Engineer Bill Kuelbs Jr points out that if the centrifuge is a sufficiently large percentage of the ship’s total mass, it will not prevent turning. What it will do is alter the axis of any turning force by ninety degrees. The technical term is gyroscopic precession. Rev up a toy gyroscope and try to turn it and you’ll see what I mean.
The solution to that is fairly simple. The turning thrusters will have to be effectively at ninety degrees to where you’d expect.
In reality, this means that when the centrifuge is spinning, the “pitch the nose downward” control button will actually fire the “yaw to the left” thruster.
Very few helicopters have two counterrotating rotors. It’s much easier to manage the problem through adding a thruster – a tail rotor – than to build the complex mechanics and the blade angle control required from double rotors (in a smaller helicopter – if it needs two rotors anyway things change).
Example: The Mote In God’s Eye
The Mote in God’s Eye is a science fiction novel by American writers Larry Niven and Jerry Pournelle, first published in 1974. The story is set in the distant future of Pournelle’s CoDominium universe, and charts the first contact between humanity and an alien species.
Here is a visualization of one of the spaceships in the novel, the I.N.S.S. MacArthur, made by William Black.
Jonathan Cresswell-Jones writes
To get some Niven overlap, the design of INSS Macarthur in MOTE spun the whole ship for simulated gravity on long periods on station (using flywheels to create the spin), then stopped the spin to accelerate for shorter periods of time.
I assume the flywheels would be stationary during acceleration mode, since the gyroscopic effects would be undesirable in battle and a damaged flywheel could explode if spinning.
Nicholas Bretagna II expands on this idea
The flywheel would be the equivalent of the counter-rotating cylinder.
Consumption of angular momentum means to spin it one way, something has to spin in the other (alternately, eject reaction mass to convert linear motion to angular momentum, but that’s not part of this idea, but IS how things are mostly done right now).
So — assume the flywheel spun ONE way, and it was along the central (“spin”) axis of the ship. Then the ship would spin the OPPOSITE way, with a clear mass-rotational speed relationship (e.g., the flywheel mass related to the ship mass, the flywheel speed related to the ship “spin” rate.
To slow the spin “for gravity”, you slow the flywheel back down. The “gravity” spin would slow in a proportional manner. When the flywheel stopped, the spin gravity would be gone, because that is where the whole system started (I’m ignoring losses to to friction, entropy, etc., of course).
Hence your “I assume the flywheel would be stationary during acceleration mode”, is unnecessary. It’s inherent in the overall design concept. You spin it up to get the ship rotating in the opposite direction, you spin it down to stop the spin, both reaching zero at nominally the same instant.
External Links
The Bizarre Behavior of Rotating Bodies – Veritasium – The Dzhanibekov Effect or Tennis Racket Theorem
Artificial gravity/Atomic rockets
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