2000s

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.

Humans have five senses: sight, hearing, touch, taste, and smell.

Humans have far more than five senses. Scientific consensus recognizes at least 20, including proprioception (body position), equilibrioception (balance), nociception (pain), thermoception (temperature), and interoception (internal body states).

The completion of the Human Genome Project will unlock the genetic basis of most diseases and enable personalized medicine in the near future.

The completed genome revealed far greater complexity than anticipated. Most diseases are polygenic and environmentally influenced. The 'one gene, one disease' model was vastly oversimplified. What was called 'junk DNA' - 98% of the genome - turned out to be regulatory and functional.

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.

Animals act purely on instinct and do not experience emotions, form memories, or engage in complex reasoning.

Decades of research in ethology and comparative psychology have documented complex emotions, long-term memory, social learning, and problem-solving across many animal species.

Male pattern baldness is inherited from your mother's side of the family.

Male pattern baldness is polygenic, involving variants from both maternal and paternal chromosomes. The androgen receptor gene on the X chromosome plays a significant role but multiple loci on autosomes also contribute.

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.

Scientists are divided on whether human-caused climate change is real or significant.

Scientific consensus on human-caused climate change was well established in 2001. The IPCC's Third Assessment Report (2001) stated the evidence was 'unequivocal.' The apparent debate was manufactured by the fossil fuel industry.

There is significant scientific debate about the extent and causes of climate change.

The IPCC's Fourth Assessment Report (2007) declared the evidence for human-caused warming 'unequivocal' - the strongest language the body had used. The same year, Al Gore and the IPCC shared the Nobel Peace Prize for climate communication.

Corn ethanol and other first-generation biofuels are a clean, climate-friendly alternative to fossil fuels.

Life-cycle analysis found that corn ethanol produced comparable or greater greenhouse gas emissions than gasoline when land-use change was included. The biofuel mandate drove up global food prices and contributed to food insecurity in developing nations.

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.

Deregulated financial markets are self-correcting. Complex financial instruments like mortgage-backed securities distribute risk safely throughout the system.

The deregulation of the 1990s and 2000s, combined with inadequate oversight of mortgage-backed securities and credit default swaps, produced the worst financial crisis since the Great Depression. Lehman Brothers collapsed September 15, 2008. The crisis erased $11 trillion in household wealth.

Economic recovery - measured by GDP growth - means the recession is over and conditions are improving.

The US economy technically exited recession in June 2009, but unemployment continued rising to 10% by October 2009 and remained elevated for years. Aggregate economic measures masked the persistent suffering experienced by workers. The 2009 graduates entered the worst job market for new graduates since the Great Depression.

Real estate is always a safe long-term investment because housing prices have historically never fallen nationwide.

The US housing market peaked in 2006 and began falling in 2007. The subsequent collapse wiped out trillions in household wealth, triggered the worst financial crisis since the Great Depression, and produced the largest foreclosure wave in American history.

Saddam Hussein's Iraq possesses weapons of mass destruction - a certainty cited repeatedly by US and UK government officials.

No weapons of mass destruction were found in Iraq after the 2003 invasion. The intelligence was flawed, misrepresented, and in some cases fabricated. The Iraq Survey Group concluded Saddam had ended his WMD programs in 1991.

The Iraq War was justified by Saddam Hussein's possession of weapons of mass destruction.

The Iraq Survey Group's final report (September 2004) concluded Iraq had no active WMD programs and had dismantled them in 1991. The intelligence failure was compounded by political pressure to find a WMD case.

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.

Mass surveillance programs - collecting metadata and communications at scale - are effective tools for preventing terrorism.

Multiple post-9/11 reviews found that bulk metadata collection programs (NSA's Section 215 program) produced no cases where bulk surveillance was essential to preventing an attack. The Privacy and Civil Liberties Oversight Board concluded in 2014 that the program was illegal and ineffective.

High-stakes standardized testing (No Child Left Behind, 2002) will accurately measure school quality and drive improvement in student achievement.

NCLB produced widespread 'teaching to the test,' narrowed curricula, inflated scores without real achievement gains, and used flawed Adequate Yearly Progress metrics that misclassified many schools. It was replaced by Every Student Succeeds Act in 2015.

Paul Revere rode through the night shouting 'The British are coming!' to warn colonists.

Revere and other riders used discretion to avoid British patrols. Revere likely said 'the regulars are coming out.' Multiple riders participated. Revere was captured before reaching Concord.

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.

Major financial institutions are too large and interconnected to be allowed to fail; the government will always intervene to protect the broader economy.

The government allowed Lehman Brothers - then the fourth-largest US investment bank - to fail on September 15, 2008. The failure triggered a global credit freeze. The claim that other institutions were 'too big to fail' was confirmed when the government then did intervene for AIG, Citigroup, and others - but the inconsistency revealed there was no coherent policy.

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.

George Washington's dentures were carved from wood.

Washington's dentures were constructed from combinations of human teeth, animal teeth (cow, horse), hippopotamus ivory, elephant ivory, and lead alloy. No wood was used. The myth likely arose from the staining and darkening of ivory.

0.999... (repeating nines) approaches 1 but never actually equals 1.

0.999... is exactly equal to 1, not approximately equal. They are two representations of the same real number. Since 1/3 = 0.333..., multiplying both sides by 3 gives 0.999... = 1. More formally, the real number system defines a repeating decimal as the limit of its partial sums, and the limit of 0.9, 0.99, 0.999, ... is exactly 1.

Abstinence-only sex education is the most effective approach to preventing teen pregnancy and STIs.

Multiple large-scale studies found that abstinence-only programs do not delay sexual initiation, reduce teen pregnancy, or lower STI rates compared to comprehensive sex education. Some studies found higher rates of unprotected sex among abstinence-pledgers.

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.

Reading in dim light damages your eyesight.

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

The H1N1 swine flu vaccine was developed too quickly and may be unsafe.

The 2009 H1N1 vaccine was developed using the same established process as seasonal flu vaccines and had a comparable safety profile. The vaccine was monitored by multiple national and international surveillance systems and found to be safe and effective.

Margarine is healthier than butter because it is lower in saturated fat.

Early margarines contained trans fats, which are more harmful than the saturated fat in butter. Modern margarines have improved but are still highly processed. Butter in moderation is now considered acceptable by many nutritionists.

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.

A low-fat diet is the healthiest way to eat and prevent heart disease.

Fat quality matters more than fat quantity. Unsaturated fats (olive oil, nuts, fish) are healthy; trans fats and excessive refined carbs are harmful. The low-fat dogma contributed to increased sugar consumption.

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.

Eating too much sugar causes Type 2 diabetes.

Type 2 diabetes is caused by a combination of genetic factors, insulin resistance, and overall metabolic health. While excessive sugar consumption contributes to obesity (a risk factor), sugar itself does not directly cause diabetes. Type 1 diabetes is an autoimmune condition unrelated to diet.

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.

Dinosaurs were covered in scales, not feathers.

Many dinosaurs, especially theropods, had feathers. Birds are living dinosaurs. Feathered fossils have been found extensively in China and elsewhere.

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.

T-Rex arms were tiny and useless.

T-Rex arms were surprisingly strong and muscular. They may have been used for grasping prey, mating, or helping the animal rise from a prone position.

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.

DARE effectively prevents youth drug use.

Multiple large-scale evaluations found DARE had no statistically significant effect on drug use rates.

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

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

Violent video games cause aggressive behavior and desensitize players to real-world violence.

Decades of research failed to find a consistent causal link between violent games and real-world violence.

Rote memorization and repetition are the best ways to learn and retain information.

Active recall, spaced repetition, and interleaved practice are more effective than simple repetition. Learning science emphasizes understanding over rote memorization.

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.

Social networking sites (Facebook, MySpace, YouTube - launched 2005) are neutral communication tools with no significant psychological effects.

Research has linked heavy social media use to increased rates of anxiety, depression, and loneliness in adolescents. Algorithmic amplification of outrage and comparison-driving content have measurable effects on wellbeing.

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.

The Myers-Briggs Type Indicator (MBTI) is a scientifically validated personality assessment that reliably classifies people into types and predicts behavior and career fit.

The MBTI has poor test-retest reliability: roughly half of respondents get a different type when retested a few weeks later. Systematic reviews find it does not predict job performance, academic outcomes, or relationship success better than chance.

The dot-com crash proves that internet businesses are fundamentally unsustainable. The internet may be a passing economic phenomenon.

The dot-com crash eliminated overvalued companies but not the internet itself. Amazon, Google, and the surviving companies went on to become the most valuable businesses in human history. The internet became the central infrastructure of the global economy.

The smooth Y2K transition proved the concern was overblown and that technology systems are more resilient than feared.

The smooth transition likely resulted from the ~$300–600 billion spent globally on Y2K remediation. Countries that did minimal remediation still experienced minimal issues - suggesting the actual embedded bug risk may have been overstated, but this remains debated among software engineers.

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.