22 'facts' you learned in school that have since been proven wrong

When you’re trying to teach dozens of students the finer points of history and science, sometimes it’s just easier to provide a simpler narrative.

But as James Loewen chronicles in his classic book “Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong,” teaching simplistic narratives of history doesn’t do anyone any good.

The same issue exists in other subjects as well. No, Isaac Newton didn’t “discover” gravity when an apple fell on his head. And yes, Pluto is still a planet – it’s just a special kind of planet.

Like many myths, these stories often have a kernel of truth to them – it just isn’t what you learned.

Here are 22 things you may have learned in school that have since been proven wrong:

MYTH: Chameleons change colours to camouflage themselves.

In pop culture, chameleons are thought of as spiky lizards that change their skin to fit any colour or pattern in their surroundings. This belief makes them metaphors for things like disguisable military technology and talented actors.

But while their colour-changing abilities are prodigious, they mostly use it to maintain a certain body temperature and as a way to communicate with other chameleons, not to hide from predators.

In any case, cuttlefish are much better at changing colours to fit their surroundings.

MYTH: Christopher Columbus discovered America.

Library of Congress‘The Landing of Columbus.’

The belief that Christopher Columbus discovered America is apparently widespread. In a 2005 survey from the University of Michigan, 85% of Americans believed that Columbus discovered the continent while only 2% of respondents were able to correctly answer that Columbus couldn’t have possibly discovered America because Native Americans already lived here.

In any case, the first European to land in America is widely accepted by historians to be the Viking explorer Leif Erikson, who sailed from Greenland to Newfoundland in Canada in around 1,000 A.C.

Columbus is historically significant because, in his 1492 voyage to the Americas, he brought diseases that killed a massive portion of the Native American population – some suggest as much as 90% – and paved the way for European imperialism in the Western Hemisphere.

MYTH: You can only taste certain things on certain parts of your tongue.

Matt Cardy/Getty ImagesIsn’t that sweet?

According to the tongue map myth, different parts of your tongue are for different sorts of tastes. The back of your tongue detects bitter tastes, the front takes in sweet tastes, and so on.

This is wrong. Taste receptors are all over your tongue, and they all pick up all kinds of tastes.

It’s true that some taste buds are more receptive to certain kinds of tastes than others, but the difference is slight, according to the University of Florida Center for Smell and Taste, and the locations of those taste buds aren’t in accordance with the “tongue map.”

MYTH: Abraham Lincoln freed the slaves.

Senate.govAbraham Lincoln signing the Emancipation Proclamation.

The historical interpretation of Lincoln emancipating slaves in the United States isn’t so wrong as it is simplistic. In that narrative of history, Lincoln fought the Civil War over slavery, and the Emancipation Proclamation and Thirteenth Amendment of the United States Constitution were his legal tools for ending slavery.

But that narrative displaces slaves from the center of the narrative and focuses only on the actions of one white man. While Lincoln, significantly, chose to wage the Civil War rather than not, and took legal steps to grant former slaves citizenship, slaves themselves struggled for centuries to be recognised as people under the law and escape their bondage.

“Lincoln moved more slowly and apparently more reluctantly toward making it a war for freedom than black leaders, abolitionists, radical Republicans, and the slaves themselves wanted him to move,” James McPherson, a Civil War historian, wrote in “Who Freed the Slaves?”

MYTH: Slavery was confined to the South.

Library of CongressAn illustration of George Washington and his farm from around 1855.

America always had its abolitionist movements, but slavery existed in every colony. Massachusetts, in the northern United States, was the first colony to legalise slavery. And in 1720, around a fifth of New York’s population were slaves. George Washington and Thomas Jefferson, among other founding fathers, owned hundreds of slaves.

It wasn’t until after the Revolutionary War that the abolitionist movement began to be a significant political force. At that point, it was up to each individual state to outlaw slavery. Vermont was the first state to abolish the institution, and more northern states followed soon after that. By the Civil War, it was only the states under the Mason-Dixon line that hadn’t abolished slavery.

MYTH: Sir Isaac Newton “discovered” gravity when an apple fell on his head.

Hulton Archive/Getty ImagesSir Isaac Newton thinking about gravity after an apple fell from a tree (but not on his head).

Newton’s apple legend isn’t true, but like many urban legends, it’s an embellished version of something that actually happened. An apple didn’t fall on Newton’s head, but Newton did start theorizing about gravity when he saw an apple falling from a tree and started thinking about it.

The very event was inscribed in Sir Isaac Newton’s memoir, where he recalls going outside after dinner with a friend.

we went into the garden, & drank thea under the shade of some appletrees, only he, & myself. amidst other discourse, he told me, he was just in the same situation, as when formerly, the notion of gravitation came into his mind. “why should that apple always descend perpendicularly to the ground,” thought he to him self: occasion’d by the fall of an apple, as he sat in a comtemplative mood: “why should it not go sideways, or upwards? but constantly to the earths centre? assuredly, the reason is, that the earth draws it. there must be a drawing power in matter. & the sum of the drawing power in the matter of the earth must be in the earths center, not in any side of the earth. therefore dos this apple fall perpendicularly, or toward the center. if matter thus draws matter; it must be in proportion of its quantity. therefore the apple draws the earth, as well as the earth draws the apple.”

Of course, today our account of physics is far more precise than Newton’s notion of gravity. He didn’t account for General Relativity, theorised by Albert Einstein more than 200 years after Newton died, and developing ideas in Quantum Mechanics problematize Newton’s theories even more.

MYTH: Albert Einstein failed maths in school and was a terrible student.

Getty ImagesAlbert Einstein really was a genius.

It’s an attractive idea for young kids. Maybe you’re bad at school, but you can still bloom as a genius later in life.

While examples of late-blooming talents are everywhere, Einstein isn’t one. He was an excellent student in maths – and everything else – when he was younger.

The myth that he flunked a maths class may be from when he failed the entrance exam to the Zurich Polytechnic. But he was still a couple of years from graduating high school at the time, and he didn’t speak a lot of French, the language the exam was given in. Furthermore, he passed the mathematics section, but failed the language, botany, and zoology sections.

There are many other myths about Einstein that are untrue. For example, he learned to read early (not late) in life and he probably didn’t have a learning disability.

MYTH: Diamonds are made from ultra-pressurised coal.

Chris Jackson/Getty ImagesKate Middleton with her sapphire engagement ring, surrounded by diamonds.

Both coal and diamonds are formed from carbon under the surface of the Earth, which is where the myth comes from. But the carbon that forms diamonds is much more pure, and the process requires much more heat and pressure.

MYTH: According to all known laws of aviation, there is no way a bee should be able to fly.

sumikophoto/ShutterstockLook, it’s flying.

As the myth goes, its wings are too small to get its fat little body off the ground. The bee, of course, flies anyway because bees don’t care what humans think is impossible.

This is, of course, wrong. Bumblebees can fly. The idea may have traction because bumblebees are pretty big – they weigh about a gram – and their wings are pretty small – about a square centimeter.

But there’s a difference between a real-life biological being and a mathematical model of it. Honeybees fly basically by flapping their wings really, really fast, which is the most efficient type of flapping when something needs to carry heavy loads, like honeybees often do.

MYTH: Convicted witches in the United States were burned at stake.

Jan VersweyveldA scene from 2016’s Broadway revival of ‘The Crucible,’ about the Salem Witch Trials.

While convicted witches in France were burned, witches in England were hanged instead. The English tradition made its way to the American colonies during the Salem Witch Trials and other places of anti-witch hysteria.

With one exception, all the convicted witches who went to their death were hanged, according to Stacey Schiff, the Pulitzer Prize-winning author of “The Witches: Suspicion, Betrayal, and Hysteria in 1692 Salem.”

That sole exception is Giles Corey, who was pressed under large stones.

MYTH: Pluto is no longer considered a planet.

NASA/JHUAPL/SwRIPluto is mostly made of ice and rock.

The International Astronomical Union (IAU) – the scientific body that decides the scientific definition of a “planet” and stuff like that – originally classified Pluto as the ninth planet that orbits the sun.

In 2005, Eris, another really big space rock that orbits the sun, was discovered. It’s 27% larger than Pluto, so it sent the IAU back to the drawing board to decide what a planet actually is.

The IAU ended up with criteria that neither Pluto nor Eris met, so neither could be one of the major planets that go around the sun.

Instead, the two are considered dwarf planets. So yes, Pluto is a planet, it’s just a dwarf planet.

MYTH: The Great Wall of China is the only man-made structure that can be seen from space.

NASAThe Great Wall of China from space.

First of all, it’s worth noting that while man-made structures like the Great Wall are visible from satellites orbiting Earth, they’re not visible at all from, say, the moon.

“The only thing you can see from the moon is a beautiful sphere, mostly white, some blue and patches of yellow, and every once in a while some green vegetation,” Apollo 12 astronaut Alan Bean told NASA. “No man-made object is visible at this scale.”

Secondly, the structures you can see largely depend on the weather and how far from our planet you actually are. In 2003, a Chinese astronaut even admitted he couldn’t see the Great Wall from space, because the weather conditions weren’t right.

Given the proper conditions, astronauts in the International Space Station can see major cities, the Great Pyramids of Giza, and some big bridges from space.

MYTH: Raindrops are tear-shaped.

Wolkenengel565/ShutterstockMillions of hamburger buns, falling from the sky.

As the United States Geographical Survey website notes, raindrops are shaped more like hamburger buns or beans. When they get really large, they split in two. Only then do they turn into a teardrop shape – only to quickly become burger buns again.

MYTH: You can’t start a sentence with a conjunction.

taekyeom/InstagramWriting is hard.

You’ve probably been taught in school that you can’t start sentences with “and” or “but.” But you can. I’ve done it several times in this article. And it’s completely fine.

Some grammar rules in the English language are unbreakable (yet are broken anyway), but the important thing to remember is that different publications have different house styles. INSIDER has its own style, based on the one set forth by the Associated Press, while The New York Times has its own, as do publishing companies like Penguin Random House. Each publication will set its own rules about grammar, like deciding whether to permit starting sentences with conjunctions, or allowing sentences to end with a preposition.

MYTH: Deoxygenated blood is blue.

Crevis/ShutterstockHemoglobin gives blood its red colour.

A common myth is that oxygenated blood is red and deoxygenated blood is blue, but this belief is inaccurate. While glancing at your skin, you may be lead to think that the veins below the surface are carrying blood that is a different colour besides red. This is actually the result of how you perceive light and the way body tissues are absorbed. According to a medically reviewed article, blood that leaves the heart is full of oxygen, and therefore bright red, while blood that travels to the heart is dark red.

So even though your veins might appear blue, green, or purple, the blood that flows in them is red – unless you’re an octopus, leech, or marine worm (among other creatures) that contains blood that is one of those hues.

MYTH: Humans only use 10% of their brains.

koya979/ShutterstockIt is impossible to tickle yourself because your cerebellum (which is located in the brain) predicts the sensation.

Maybe you heard this myth in school, or maybe you were intrigued by the idea when you saw the trailer for Scarlett Johansson’s 2014 film “Lucy,” where Morgan Freeman’s character stands in front of a room of students and says, “It is estimated, most human beings only use 10% of their brain’s capacity … Imagine if we could access 100%. Interesting things begin to happen.”

The origin of this myth is unclear, but the idea that humans are storing approximately 90 per cent untapped abilities in the brain is not true. Scientists have repeatedly been outspoken about this false claim, which has also been perpetuated by movies like “Lucy” and “Limitless.”

All the neurons in your brain may not be firing at the same time, but that doesn’t mean that parts of your brain are totally inactive.

“It turns out though, that we use virtually every part of the brain, and that [most of] the brain is active almost all the time,” Barry Gordon, a neurologist at Johns Hopkins School of Medicine said. “Let’s put it this way: The brain represents 3% of the body’s weight and uses 20% of the body’s energy.”

MYTH: Bats are blind.

Warner BrothersIf this were true, would Bruce Wayne really model his superhero identity after an animal that lacks sufficient seeing abilities?

You’ve probably heard someone use the phrase “blind as a bat” to describe someone and undermine their sense of sight. Contrary to this widespread belief, bats are not blind and their eyesight is better than most of us.

According to Rob Mies, executive director of the Organisation for Bat Conservation, large bats “can see three times better than humans.”

In addition to a normal sense of sight, bats rely on a technique known as “echolocation” at night. In low-light environments, as the term “echolocation” suggests, they are able to locate the source of sounds based on echoes that are produced. This is particularly helpful when trying to find prey and other food sources.

So maybe the next time someone says you’re “as blind as a bat,” you might want to correct them or take it as a compliment.

MYTH: Tilting your head back will stop a nosebleed.

Marcus Ericsson/Ombrello/Getty ImagesAthletes occasionally gets nosebleeds, particularly during contact sports like soccer.

When you were younger, you might have been taught to tilt your head back in order to stop a nosebleed – but doctors agree that this is not the solution. In the case of a nosebleed, do not tilt your head back like Rachel did in “Friends.”

Instead, you should tilt your head forward and pinch right below the bridge of your nose to stop the flow of blood rushing out of your nostrils.

Tilting your head back doesn’t actually cause the nosebleed to cease, and it might lead to more damage. It can cause blood to enter your throat, which leads to your stomach and further unpleasant complications.

MYTH: When you swallow gum, it stays in your body for seven years.

nyul/iStockThe first chewing gum factory in America dates back to the 1800s.

The truth is that gum will stay in your body for some time, but nowhere near seven years. Unlike most food, gum can’t be broken down by the body’s enzymes and acids. Therefore, that piece of gum goes straight through your system without being dissolved or broken into smaller pieces, and is later excreted.

Even though swallowing a wad of gum accidentally or on purpose won’t cause it to stay with you for a long period of time, it’s probably best to just spit it out when you’re finished. There have been rare cases of children having internal issues due to swallowed gum.

MYTH: Camels store water in their humps.

Flickr/Hoo LengSiongCamels do use their humps for storage, just not for the storage of water.

You might have been taught that the purpose of a camel’s hump is to store water, but this is not true. Some camels have one hump while others have two, but regardless of quantity, they serve the same purpose – to store fat.

The stored fat serves as a substitute for food when camels are travelling long distances with limited available resources. According to Animal Planet, a camel can use the fat as an energy source to replace approximately three weeks of food.

It’s actually a camel’s red blood cells that account for this animal’s ability to last one week without water. Unlike other creatures, a camel has oval-shaped blood cells that are more flexible and enable them to store large portions of water.

MYTH: You must drink eight glasses of water a day.

All kind of people/ShutterstockThis is one of the most popular health myths, also known as the “8×8” rule.

The origin of this myth isn’t entirely clear, but it is believed that people were convinced of this health rule after the Food and Drug Administration suggested the guideline in a 1945 published paper. If you heard this rule from a doctor, family member, or teacher, you probably believed it was an essential rule to abide by.

The truth is that you don’t need need to drink eight glasses of water each day. Your body will still receive necessary hydration from other fluids and foods. It’s probably best to drink a healthy amount of water and indulge in a moderate amount of less healthy beverages (like sugary ones).

The most important thing is remembering that your body needs to maintain a balance, since fluids are constantly entering and leaving the body. The amount of hydration needed also varies from person to person, since there are factors like age, health conditions, and activity level to take into consideration.

MYTH: There’s a five-second rule that applies to food that falls on the floor.

FlickrIf you drop a piece of cake on the floor, it’s best to chalk it up as a loss.

If you’ve ever dropped a piece of food on the floor and quickly picked it up within five seconds, deeming it safe to eat, you have been misguided by a popular health myth. According to the five-second rule, food that falls on the floor is acceptable to consume – as long as it hasn’t stayed on the unclean surface for more than five seconds.

Research has found that the rule is not accurate or applicable. The longer dropped food stays on a surface, the more germs it attracts, but regardless, food will instantly become contaminated as soon as it touches the floor.

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