Think again

You’ve been wrong all along—10 facts that prove how little we really know

Image: Elimende Inagella

You repeat them every day—often without thinking twice. But a surprising number of "facts" we take for granted are just plain wrong. Whether it’s the recommended water intake or the behavior of lightning, prepare for a reality check. These 10 everyday misconceptions will make you rethink everything you thought you knew.

Image: Ladislav Stercell

You lose heat through any part of your body that’s exposed—not just your head. This myth likely started from an outdated military study in which soldiers in Arctic conditions wore full-body gear but no hats, for some reason.

Heat loss is driven by surface area and exposure. If you're unlucky enough to be naked in freezing weather, you'll lose heat evenly across your body—not primarily from your scalp.

Image: Leo Rivas

Pure water is actually a very poor conductor of electricity. It’s the impurities in water—like dissolved minerals and salts—that allow it to carry an electric current.

However, since the water we commonly encounter is rarely pure, it readily conducts electricity—making contact between water and electrical sources hazardous.

Image: Supply

Also, nope—it only looks that way. Shaved hair has a blunt edge, which can make it feel coarser or appear darker than unshaved hair.

Hair growth is determined by follicles beneath the skin. Since shaving only trims hair above the surface, it has no effect on thickness, color, or growth rate.

Image: Ahmed Zayan

Goldfish can actually remember things for weeks, even months. They’re far smarter than we usually give them credit for.

Moreover, studies have shown goldfish can be trained to respond to feeding times and light cues. So don’t keep yours in a tiny bowl—it’s far too small for their cognitive and physical needs.

Image: NOAA

It absolutely does—and often. The Empire State Building gets hit about 25 times a year. This is because lightning follows the path of least resistance, which often means tall, conductive structures get hit repeatedly.

So, if you’re caught in an electrical storm, don’t run toward the last spot that was struck—chances are, lightning will hit there again!

Image: C. G.

Glass is an amorphous solid—not a liquid—and despite popular belief, its molecules don’t flow over time.

The myth likely originated from old window panes, which are sometimes thicker at the bottom. This thickness is due to historical manufacturing techniques—not because gravity caused the glass to flow downward.

Image: Joseph Greve

Hydration needs vary depending on age, activity level, climate, and diet—and they don’t require exactly eight glasses. Food and other beverages also count toward your fluid intake.

In reality, the "8 glasses a day" rule isn’t based on hard science; it’s simply a general guideline to prevent dehydration. Under normal conditions, drinking when you’re thirsty is usually enough to stay well hydrated.

Image: Олег Мороз

Blood is always red—it only appears blue through the skin because of how light interacts with tissue and veins.

The only real color difference is that oxygen-rich blood is bright red, while deoxygenated blood is a darker red. Humans and other vertebrates do not have truly blue blood.

Image: Quinten de Graaf

While it’s true that swallowed gum can’t be digested, it doesn’t stay in your stomach—it passes through the digestive system normally.

The same happens with things like corn kernels or hard seeds. Only when large amounts of gum are swallowed—often along with other indigestible objects—can it lead to blockages or health issues.

Image: Romain GROSSIER

While a sleepwalker may be confused or startled if awakened, it’s not inherently dangerous and can sometimes be the safest way to prevent accidental injury.

Experts often recommend gently guiding sleepwalkers back to bed, but waking them is also acceptable if there’s an immediate risk of harm.

UNSUNG HEROES

10 Extraordinary Individuals Who Helped Saved Millions

Image: Ben White

In the annals of history, there are hundreds of people whose actions have, in some way or another, shaped the course of humanity for the better. In difficult circumstances, these men and women were presented with the unexpected opportunity to help save others and did it without thinking twice about the consequences.

Here we'll be looking at real heroes of humanity who, throughout history, helped save countless lives.

Image: Burgess Milner

In the tense atmosphere of the Cold War, Stanislav Petrov, a Soviet military officer, found himself facing a critical decision that would shape the course of history. On September 26, 1983, Petrov was serving as a lieutenant colonel in the Soviet Air Defense Forces when the early-warning system erroneously detected incoming missiles from the United States, signaling the start of a potential nuclear attack. Despite overwhelming pressure to retaliate, Petrov trusted his instincts and reported the alarm as false, avoiding almost certain nuclear annihilation.

Image: Thomas Despeyroux

Norman Borlaug, an American agronomist, dedicated his life to combating global hunger and poverty through agricultural innovation. In the mid-20th century, Borlaug spearheaded the Green Revolution, a series of agricultural advancements that dramatically increased crop yields and food production worldwide, saving over a billion lives from starvation.

Image: CDC

Henrietta Lacks, an African American woman, unknowingly revolutionized modern medicine through her immortal cancerous cells, which were taken without her consent during her cancer treatment in 1951. Although she didn’t live to see it, her cells - now known as HeLa cells - were used in invaluable medical research and countless scientific discoveries, including the polio vaccine and in-vitro fertilization.

Image: Mufid Majnun

Although his name is not widely known, Maurice Hilleman - an American microbiologist - is credited with saving millions of lives through his development of over 40 vaccines, including those for measles, mumps, rubella, and hepatitis B. His pioneering work in vaccine research and development has had a profound impact on public health worldwide, significantly reducing the prevalence of deadly infectious diseases, and helping save as many as eight million lives each year.

Image: LuAnn Hunt

James Harrison, an Australian blood donor known as the "Man with the Golden Arm," has saved an estimated 2.5 million lives through his blood plasma donations. Harrison's blood contains a unique antibody that is used to develop Anti-D immunoglobulin, a lifesaving treatment for Rhesus disease, a condition that can cause severe complications in newborns. An Australian national hero, he made a total of 1,173 donations before reaching age 81 - the oldest you are allowed to donate blood under Australian policies.

Image: Viktor Hesse

Alexei Ananenko, Valeri Bespalov, and Boris Baranov, three Soviet engineers, risked their lives to prevent a catastrophic nuclear meltdown during the Chernobyl disaster in 1986. Despite the immense danger posed by lethal radiation levels, they volunteered to enter the flooded basement of the damaged reactor and manually open the valves to drain water, preventing a second explosion that could have had catastrophic consequences for Europe and beyond.

Image: Gab Pili

Saving the entire planet from arguably one of the largest environmental catastrophes of history, American geochemist Clair Cameron Patterson, dedicated his life to raising awareness about the dangers of lead pollution and advocating for environmental regulations to protect public health. His research on lead contamination in the environment led to the removal of lead from gasoline and other consumer products, resulting in significant improvements in air and water quality and preventing countless cases of lead poisoning.

Image: Anastasia Nelen

Joseph Lister is widely known as the father of antiseptics, but the extent to which his work helped revolutionize surgical practices and save lives cannot be overstated. Lister is responsible for introducing the first antiseptic surgical techniques in the 19th century. By simply promoting the use of carbolic acid as a disinfectant on surgical tools and hands during surgery, he dramatically reduced the risk of postoperative infections and mortality rates, laying the foundation of modern infection control measures.

Image: J V

During the height of the Cuban Missile Crisis in 1962, a Soviet naval officer called Vasili Arkhipov, found himself facing a pivotal moment that could well determine the fate of the entire world. Arkhipov was aboard the Soviet B-59 submarine discovered by American naval vessels in the waters near Cuba. Pressured by his superiors to use nuclear torpedoes against the US Navy, he refused to comply with the order, single-handedly preventing a nuclear war.

Image: Vincent van Zalinge

Rachel Carson, an American marine biologist and conservationist, was the first to sound the alarm about the dangers of pesticide use and its impact on the environment and human health. In her 1962 book "Silent Spring," Carson meticulously documented the harmful effects of pesticides, particularly DDT, on wildlife populations and ecosystems. Her groundbreaking research sparked a global environmental movement that helped save hundreds of species from almost certain extinction, including bald eagles.