If you graduated in 2013…
Here’s what your teachers got wrong.

Pluto is the ninth planet in our solar system.

Pluto was reclassified as a dwarf planet by the IAU in 2006. The solar system now has 8 recognized planets.

Bats are blind and rely entirely on echolocation.

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

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

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

Dogs see the world in black and white.

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

Goldfish have a memory of only 3 seconds.

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

Your hair and fingernails continue to grow after you die.

Hair and nails do not grow after death. The skin around them retracts due to dehydration, creating the illusion of growth.

Humans evolved from monkeys or apes.

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.

Ostriches bury their heads in the sand when frightened.

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.

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

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

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

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.

Nuclear power is the most dangerous energy source, with the highest death toll per unit of energy.

Nuclear power has one of the lowest death tolls per unit of energy produced. Coal and oil cause far more deaths from air pollution, accidents, and climate change. Even including Chernobyl and Fukushima, nuclear is statistically safer than fossil fuels.

Most plastic waste is recycled into new products.

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.

Betsy Ross designed and sewed the first American flag.

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.

Albert Einstein failed math in school.

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.

The Emancipation Proclamation freed all slaves in the United States.

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.

People in the Middle Ages believed the Earth was flat.

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.

Marie Antoinette said 'Let them eat cake' when told the French peasants had no bread.

There is no evidence Marie Antoinette ever said this. The quote was attributed to 'a great princess' by Rousseau in 1766, when she was only 10. It was likely revolutionary propaganda.

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

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.

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

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.

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

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

Antibiotics can cure colds and flu.

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.

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

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.

Cracking your knuckles causes arthritis.

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.

Reading in dim light damages your eyesight.

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

Eggs dramatically raise cholesterol and significantly increase heart disease risk. Healthy people should eat few or no eggs.

Dietary cholesterol has limited effect on blood cholesterol in most people. Eggs are nutritious. The 2015 Dietary Guidelines Advisory Committee removed the longstanding dietary cholesterol limit.

Eating carrots improves your night vision significantly.

Vitamin A deficiency can impair night vision, but eating extra carrots beyond normal dietary levels does not enhance vision in people who are not deficient. The myth was WWII propaganda to hide radar technology.

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

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.

Swallowed chewing gum stays in your stomach for seven years.

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

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

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.

Giving children sugar makes them hyperactive.

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

Dinosaurs were cold-blooded like modern reptiles.

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.

Pterodactyls and pterosaurs were dinosaurs.

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

Velociraptors were human-sized, highly intelligent predators.

Velociraptors were turkey-sized, about 2 feet tall. Jurassic Park used Deinonychus as the model but called them Velociraptors because the name sounded better.

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

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

Lightning never strikes the same place twice.

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

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

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

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

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

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

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.

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

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.

Drinking alcohol warms you up in cold weather.

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.