SmartAss Facts
SmartAss Facts
Popular beliefs examined with primary sources — and found to be completely false.
Some of the most confidently repeated "facts" are myths. The brain myth, the goldfish memory myth, the lightning myth — each has been circulating for decades despite being directly contradicted by peer-reviewed research. Every page here includes the primary source, the actual science, and the exact origin of the wrong belief.
False. You use virtually all of your brain, continuously. Brain imaging studies using fMRI and PET scans show …
False. Goldfish can retain memories for months, not seconds. Controlled studies have trained goldfish to opera…
False. The Great Wall of China cannot be seen by the naked eye from low Earth orbit. At its widest, the wall i…
False. No scientific study has found a causal link between knuckle cracking and arthritis. The most famous sel…
False. Lightning routinely strikes the same location many times. The Empire State Building is struck by lightn…
False. Reading in dim light causes temporary eye strain and fatigue, but no clinical evidence shows it causes …
False. Napoleon was approximately 5 feet 7 inches tall (170 cm), which was average for a French man of his era…
False. There is no scientific evidence that humans routinely swallow spiders in their sleep, and multiple biol…
False. Cattle are red-green colorblind (dichromats) and cannot distinguish red from green. Bulls in bullfighti…
False. Humans have far more than five senses. Depending on how strictly you define a "sense," modern neuroscie…
False. More than a dozen double-blind, placebo-controlled trials have found no link between sugar consumption …
False. Heat loss is proportional to the surface area of skin exposed. The human head represents roughly 10% of…
False. All known bat species have functional eyes and can see. Many bat species have good low-light vision. Mi…
False. Einstein did not fail mathematics. He mastered calculus before the age of 15, consistently excelled in …
False. Shaving has no effect on hair thickness, colour, or growth rate. This has been confirmed by multiple co…
False. Swallowed gum does not remain in the stomach for 7 years. While the gum base — the insoluble resin and …
False. Human blood is always red. Oxygenated arterial blood is bright red; deoxygenated venous blood is a dark…
False, and dangerously so. Alcohol causes vasodilation — the widening of blood vessels near the skin — which p…
Misleading. Dogs are not completely colourblind — they have dichromatic colour vision, meaning they can distin…
False. A penny dropped from a skyscraper cannot kill anyone. Due to its flat, tumbling shape, a penny reaches …
False. The idea that people have a dominant 'left brain' (logical) or 'right brain' (creative) is not supporte…
False. The '8 glasses a day' rule has no scientific basis. Daily fluid requirements vary significantly between…
False. Hair and nails do not grow after death. Growth requires active cellular metabolism — energy, glucose, a…
False. The common cold is caused by viruses — primarily rhinoviruses — not by cold temperatures. You cannot ca…
False. Most bird species have a very limited sense of smell and cannot detect human scent on their young. Bird…
False. The diagram showing sweet at the tip, bitter at the back, and salty and sour on the sides is a misrepre…
Misleading. Carrots are rich in beta-carotene, which the body converts to vitamin A — essential for retinal fu…
False. Ostriches do not bury their heads in the sand. An ostrich that buried its head would suffocate and be u…
Misleading. For most people, taking high-dose vitamin C does not prevent colds. Large meta-analyses show that …
False. Taste buds are not limited to the tongue — they also exist on the soft palate, epiglottis, upper oesoph…
False. Humps store fat, not water. Camels manage dehydration through specialised blood cells and the ability to tolerate 30% body-water loss…
False. Most diamonds formed 1–3 billion years ago in the mantle, long before coal-forming plants existed…
False. Humans and chimps share a common ancestor from ~6–7 million years ago. We are evolutionary cousins, not descendants of modern chimps…
False. Seasons result from Earth's 23.5° axial tilt. Earth is closest to the Sun in January — during Northern Hemisphere winter…
False. No scientific evidence supports this rule. The American Red Cross formally abandoned this advice…
False on two counts. Harvestmen (most common type) are not spiders and have no venom. Cellar spiders have mild venom, not record-setting…
Mostly false. Colour change is primarily for temperature regulation and social signalling. Camouflage is secondary…
False. Antibiotics only work on bacteria. They have zero effect on viruses and misuse accelerates dangerous antibiotic resistance…
It depends on the measure. Everest is highest above sea level. Mauna Kea is tallest base-to-summit. Chimborazo is furthest from Earth's centre…
False as stated. Alcohol disrupts synaptic signalling but doesn't kill neurons at typical doses. Long-term damage occurs mainly through thiamine deficiency…
False. Lightning rods intercept strikes that would occur anyway and safely conduct the energy to ground, protecting buildings…
False. Chimpanzees, crows, sea otters, dolphins, and elephants all use tools. Some even manufacture tools from raw materials…
False. The 1998 Wakefield paper was retracted as fraudulent. Dozens of independent studies across millions of children find no link…
False. The masseter generates most force, the heart does most work, the glutes move the body. The tongue holds no absolute strength record…
False. Waking a sleepwalker causes brief confusion, not serious harm. The real danger is leaving them asleep to walk into hazards…
False as a comparison. Dogs' mouths contain a different bacterial community, not a smaller one. They routinely contact faeces and decaying matter…
False. Searing creates no moisture barrier. Its real value is the Maillard reaction — creating hundreds of flavour compounds in that browned crust…
False. Flush direction is determined by the toilet's inlet jets, not the hemisphere. The Coriolis force on a toilet bowl is 10 million times too weak to matter…
False. Bacteria transfer on contact, not after five seconds. A Rutgers study found contamination in every trial including at 1-second contact…
False. Microwaves penetrate 1–3 cm and heat outer layers; heat then conducts inward. This is why the centre is often still cold after microwaving…
False. Fortune cookies were invented by Japanese-Americans in California in the early 1900s. They are virtually unknown as a traditional food in China…
The claim that humans only use 10% of their brain. Brain imaging studies confirm all brain regions are active during normal daily life.
No. Research at Plymouth University showed goldfish can retain memories for months, not seconds.
No. The wall is at most 9 meters wide — far too narrow to be resolved by the naked eye from orbital altitude.