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 This myth likely started from an outdated military study in which soldiers in Arctic conditions wore full-body gear but no hats, for some reason.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.

Names that lie

Mountain chickens are frogs? 10 animals with misleading names

Some animals have commonly been given names that might lead you to believe false things about them. For example, as we all know, guinea pigs are not pigs, sea horses are not horses, and starfish are neither stars nor fish. So, how did these names come to be? While lookalike allegations may justify some, others are simply far-fetched. Is there any truth or reason behind these inaccurate nicknames—like "firefly"? Let’s explore 10 animal names that are, arguably, misnomers.

Let’s start with one of the most far-fetched names on this list. Mountain chickens aren’t birds at all—they’re large frogs. And they don’t live in mountains, either. These frogs are found mostly in the Caribbean, inhabiting lowland rainforests and swamps. A more accurate and realistic name for them is "giant ditch frogs," which refers to their large size and their tendency to dwell near water bodies.

So, how did they get this name? The story goes that locals found the frog’s meat similar in taste and texture to chicken. Yes, this now critically endangered species was once considered a delicacy in local cuisines.

You would think that the red panda is just a smaller, red version of the giant panda. After all, they share cute faces, patches around their eyes, and similar snouts and ears. But you’d be wrong—red pandas are not bears.

Here’s the explanation: The word "panda" is believed to derive from the Nepali word ponya, which refers to animals with claws adapted for eating bamboo. This is the biggest trait red and giant pandas have in common: their heavily bamboo-based diets. Red pandas, sometimes nicknamed "firefoxes," belong to a mammal family of their own and are more closely related to skunks than to giant pandas.

Titmouses aren’t rodents—did you know? Instead, they are songbirds known for their gray or bluish-gray feathers. One of the most common species is the tufted titmouse, and you’ll be pleased to know that the plural form is, indeed, "titmice."

The name "titmouse" comes from Old English, where tit referred to a small creature, and mase was a general term for a bird. Over time, mase became obsolete, and "titmase" was transformed into "titmouse" due to the similarity between the words. Arguably, there’s also some physical resemblance between the gray color and beady, round eyes of both titmice and mice.

Yes, the name "electric eel" is misleading—but not for the reasons you might think. These aquatic animals are indeed capable of generating shocks of electricity, up to ​​860 volts, which they use to stun their prey or defend themselves. However, strictly speaking, they are not eels.

Unlike true eels, which belong to the family Anguillidae, electric eels are part of the knifefish family and are more closely related to catfish. Early European explorers misnamed them based on their elongated, eel-like bodies.

Seahorses are fish, just like salmon or clownfish. Arguably, they look nothing like those species. Instead, for centuries, humans have noticed their resemblance to horses. Seahorses have a distinctive upright swimming posture, elongated heads and necks, and a caudal fin that even resembles a horse’s mane.

Their scientific name, Hippocampus, is borrowed from the Ancient Greek word hippókampos. Interestingly, the term didn’t originally refer to this animal but to a mythological marine creature. In Greek, hippos means "horse," and kampos means "sea monster."

Guinea pigs aren’t pigs—nor are they from Guinea, the West African country. Instead, they are rodents native to South America. By now their name has become synonymous with "experiment subject" because of how frequently they were used in scientific research.

There are a couple of theories behind their misleading name. The "pig" part likely comes from the squealing noises they make, which resemble those of piglets. As for "guinea," it might derive from the British coin of the same name, implying they were sold for its equivalent value. Another theory is that European sailors, associating distant Guinea with anything exotic, mistakenly applied the name to these South American rodents.

The koala is often called a "koala bear," but it’s not a bear at all. European settlers in Australia gave it this name because its round face and fluffy ears reminded them of bear cubs.

Koalas are, in fact, marsupials. Like kangaroos, they carry their young in pouches. The word koala comes from the Dharug language (an Aboriginal language of Australia) and is believed to mean "no water," referring to the koala's ability to survive on eucalyptus leaves with minimal water intake. Did you know? Eucalyptus leaves are low in nutrients and mildly toxic. As a result, koalas have a slow metabolism and sleep up to 20 hours a day.

Fireflies don’t handle fire. They do, however, possess the ability to produce light, a phenomenon called bioluminescence. This light creates the illusion of tiny flames flying through the night. No wonder they have been associated with magic and fascination for centuries.

Despite their name, fireflies aren’t flies—they’re beetles. They produce light through a chemical reaction in their abdomens, which they use to attract mates or communicate. In fact, ​​different firefly species flash in distinct rhythms to help them identify each other.

The first time you hear the term "prairie dogs," you might picture packs of dogs roaming freely across the prairies. In reality, these animals are rodents and belong to the ground squirrel family.

The name is believed to have been given by early European settlers due to their high-pitched sounds. Prairie dogs are capable of producing sophisticated and varied calls to communicate with one another, sometimes sounding like man’s best friend. The "prairie" part of their name comes from their habitat—vast grasslands and prairies across North America. These rodents are expert burrowers and typically live in small family groups called "coteries," where members groom and protect each other.

It’s not only that ladybugs aren’t all female—they aren’t truly bugs, either. Instead, they are a type of beetle. These round and colorful insects have been widely associated with good luck and fortune for centuries. The reason for this has to do with the story behind their nickname.

The name "ladybug" originated in the Middle Ages, when farmers prayed to the Virgin Mary for help with pests in their crops. The beetles, which helped control aphid populations, were called "Our Lady's birds" or "Our Lady's beetles," later shortened to "ladybirds" or "ladybeetles." Over time, much to the frustration of entomologists, this evolved into the popular term "ladybugs."