If you graduated in 2015…
Here’s what your teachers got wrong.

We found 0 facts that have been updated since 2015.

Bats are blind and rely entirely on echolocation.

Now we know:

Most bats can see reasonably well and use vision alongside echolocation. The phrase 'blind as a bat' is entirely false.

Disproven1970

Biology

You were taught:

Camels store water in their humps to survive in the desert.

Now we know:

Camels store fat in their humps, not water. Water conservation comes from efficient kidneys, concentrated urine, and tolerance to dehydration.

Disproven1950

Biology

You were taught:

Chameleons change color primarily to blend in with their surroundings and hide from predators.

Now we know:

Chameleons change color mainly for communication (mood, temperature, mating signals) and social interaction. Camouflage is a secondary function at best.

Disproven1981

Biology

You were taught:

Dogs see the world in black and white.

Now we know:

Dogs see colors, but their spectrum is limited compared to humans. They see shades of blue and yellow but cannot distinguish red and green.

Disproven1989

Biology

You were taught:

Goldfish have a memory of only 3 seconds.

Now we know:

Goldfish can remember things for months, recognize their owners, and learn complex tasks.

Disproven2003

Biology

You were taught:

Humans evolved from monkeys or apes.

Now we know:

Humans and modern apes share a common ancestor. We did not evolve from any living ape species. The common ancestor lived 6-8 million years ago.

Disproven1859

Biology

You were taught:

Ostriches bury their heads in the sand when frightened.

Now we know:

Ostriches do not bury their heads in the sand. When threatened, they lie flat on the ground or run. The myth likely arose from their nesting behavior (turning eggs in the sand) or from seeing them lying low with heads near the ground.

Disproven1950

Biology

You were taught:

Different parts of the tongue detect different tastes: sweet on the tip, bitter on the back.

Now we know:

All taste buds can detect all five basic tastes. There are no tongue zones.

Disproven1974

Geography

You were taught:

The Great Wall of China is the only human-made object visible from space (or from the Moon).

Now we know:

The Great Wall is very difficult to see with the naked eye from low Earth orbit and is not visible from the Moon. Many structures (cities, highways, airports) are more visible.

Disproven1945

Geography

You were taught:

Most plastic waste is recycled into new products.

Now we know:

Only about 9% of plastic ever produced has been recycled. Most is landfilled, incinerated, or enters the environment. Recycling symbols on plastic are resin identification codes, not recyclability guarantees.

Disproven2017

History

You were taught:

Betsy Ross designed and sewed the first American flag.

Now we know:

There is no contemporary evidence linking Betsy Ross to the first flag. The story was promoted by her grandson William Canby in 1870, nearly a century after the supposed event, with no documentation.

Disproven1870

History

You were taught:

Albert Einstein failed math in school.

Now we know:

Einstein excelled in mathematics from an early age. He taught himself calculus by age 12 and was doing advanced math before most students. The myth conflates a change in grading systems.

Disproven1935

History

You were taught:

The Emancipation Proclamation freed all slaves in the United States.

Now we know:

The Emancipation Proclamation only freed slaves in Confederate-held territories, not in Union border states or areas already under Union control. The 13th Amendment (1865) abolished slavery nationwide.

Disproven1865

History

You were taught:

People in the Middle Ages believed the Earth was flat.

Now we know:

Educated people in medieval Europe knew the Earth was round. The myth was popularized by 19th-century writers (notably Washington Irving) as part of a narrative pitting science against religion.

Disproven1900

History

You were taught:

Witches were burned at the stake during the Salem witch trials.

Now we know:

No one was burned at Salem. Nineteen people were hanged, one was pressed to death with stones, and several died in jail. Burning was the European punishment, not the American one.

Disproven1860

History

You were taught:

Vikings discovered America but then vanished without leaving a lasting presence.

Now we know:

Norse explorers established a settlement at L'Anse aux Meadows in Newfoundland around 1000 CE. Evidence suggests further exploration southward. They did not 'vanish' - the settlement was abandoned, likely due to conflict with Indigenous peoples and limited resources.

Disproven1945

Medicine

You were taught:

Shaving makes hair grow back thicker, darker, or faster.

Now we know:

Shaving only cuts hair at the surface. It does not affect growth rate, thickness, or color. The blunt tip may feel coarser temporarily.

Disproven1928

Medicine

You were taught:

Antibiotics can cure colds and flu.

Now we know:

Antibiotics target bacteria, not viruses. Colds and flu are caused by viruses. Taking antibiotics for viral infections contributes to antibiotic resistance without helping the patient.

Disproven1950

Medicine

You were taught:

Normal human body temperature is exactly 98.6°F (37°C).

Now we know:

Body temperature varies by person, time of day, and measurement method. A 2020 study found the average is closer to 97.5°F (36.4°C) and has been declining slightly over time.

Disproven1992

Medicine

You were taught:

Cracking your knuckles causes arthritis.

Now we know:

No study has found a causal link between knuckle-cracking and arthritis. One doctor cracked only one hand's knuckles for 50 years with no difference.

Disproven1998

Medicine

You were taught:

Reading in dim light damages your eyesight.

Now we know:

Reading in low light causes temporary eye strain but does not cause permanent damage to eyesight.

Disproven2007

Nutrition

You were taught:

Detox diets, cleanses, and specific foods can remove toxins from your body.

Now we know:

The liver, kidneys, lungs, and skin already detoxify the body effectively. There is no scientific evidence that detox diets, cleanses, or supplements remove toxins better than these organs do.

Disproven1963

Nutrition

You were taught:

You should drink eight 8-ounce glasses of water per day (64 ounces total).

Now we know:

Water needs vary by individual, activity level, climate, and diet. There is no universal requirement. The '8x8 rule' has no scientific basis.

Disproven2002

Nutrition

You were taught:

Swallowed chewing gum stays in your stomach for seven years.

Now we know:

Chewing gum passes through the digestive system normally. It is not digestible but is excreted like other indigestible materials.

Disproven2000

Nutrition

You were taught:

Drinking red wine is good for your heart due to resveratrol and antioxidants.

Now we know:

The evidence for red wine's heart benefits is weak and confounded by lifestyle factors. The 'French Paradox' was largely based on flawed data. Any potential benefits are outweighed by the known harms of alcohol.

Disproven2022

Nutrition

You were taught:

Giving children sugar makes them hyperactive.

Now we know:

Controlled studies show no consistent causal link between sugar and hyperactivity. Parental expectations likely explain the perceived effect.

Disproven1994

Paleontology

You were taught:

Dinosaurs were cold-blooded like modern reptiles.

Now we know:

Many dinosaurs were warm-blooded (endothermic) or had intermediate metabolisms. Evidence includes bone structure, growth rates, and the discovery of feathered dinosaurs in cold climates.

Disproven1968

Paleontology

You were taught:

Brontosaurus was reclassified as Apatosaurus and is not a real genus.

Now we know:

A 2015 study suggested Brontosaurus may be distinct enough to be its own genus after all, though this remains debated.

Disproven2015

Paleontology

You were taught:

Pterodactyls and pterosaurs were dinosaurs.

Now we know:

Pterosaurs were flying reptiles, not dinosaurs. Dinosaurs belong to the clade Dinosauria; pterosaurs belong to Pterosauria. They are close relatives but distinct groups.

Disproven1842

Physics

You were taught:

Centrifugal force is a real outward force that pushes objects away from the center of rotation.

Now we know:

Centrifugal force is a fictitious (inertial) force - it only appears in rotating reference frames. The real force is centripetal, pulling inward.

Disproven1687

Physics

You were taught:

Lightning never strikes the same place twice.

Now we know:

Lightning frequently strikes the same place multiple times. Tall structures like the Empire State Building are struck dozens of times per year.

Disproven1930

Psychology

You were taught:

Students have distinct learning styles (visual, auditory, kinesthetic) and should be taught according to their preferred style.

Now we know:

There is no scientific evidence supporting the 'learning styles' hypothesis. Teaching to a preferred style does not improve outcomes.

Disproven2009

Psychology

You were taught:

People are left-brained (logical) or right-brained (creative).

Now we know:

Both hemispheres work together. Functions are not neatly divided by personality type.

Disproven2013

Psychology

You were taught:

Students have either a 'fixed mindset' or a 'growth mindset,' and teaching growth mindset significantly improves academic outcomes.

Now we know:

Meta-analyses show mixed results for growth mindset interventions. The effect sizes are often small, and the dichotomy oversimplifies human motivation and learning.

Disproven2018

Psychology

You were taught:

Some people have photographic memory and can recall images with perfect accuracy.

Now we know:

True eidetic memory (photographic recall) has never been reliably demonstrated in adults. Hyperthymesia (highly superior autobiographical memory) is real but extremely rare. Most 'photographic memory' claims are explainable by trained mnemonic techniques.

Disproven1951

Psychology

You were taught:

We only remember 10% of what we read and 20% of what we hear - known as 'Dale's Cone of Experience.'

Now we know:

Dale's Cone was originally about instructional media, not retention percentages. The specific percentages were added later by anonymous sources and have no scientific basis.

Disproven2006

Technology

You were taught:

The 'new math' / Common Core math is unnecessarily complicated and represents a decline in math education.

Now we know:

Common Core emphasizes conceptual understanding and multiple problem-solving strategies. Research supports this approach, though implementation was often poorly communicated to parents.

Disproven2020

Drugs & Toxins

You were taught:

Drinking alcohol warms you up in cold weather.

Now we know:

Alcohol causes blood vessels to dilate, creating a warm feeling on the skin but actually increasing heat loss from the core body. It increases hypothermia risk.

Disproven1950