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 This myth likely started from an outdated military study in which soldiers in Arctic conditions wore full-body gear but no hats, for some reason.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

The 12 longest-living animals on Earth (and how they cheat time)

Nature doesn’t just create beauty, it crafts survival miracles. While most animals have short lives, a rare few have mastered the art of staying alive for centuries, even millennia. These aren’t just long-lived creatures; they’re nature’s ultimate time travelers. From the frozen depths of the oceans to the darkest corners underground, they’ve developed bizarre, brilliant strategies to cheat death. Get ready to meet 12 animals whose lifespans will absolutely blow your mind.

Record age: up to 15,000 years

This unassuming sea sponge thrives in the freezing waters of Antarctica, where temperatures hover around 28.6 °F—so cold that biological processes hit the brakes. In such icy conditions, metabolism slows to a crawl, allowing these sponges to live for thousands of years.

Some have reached impressive sizes of over 3 feet tall and have been around since mammoths were still thundering across the tundra. They don’t move, they don’t stress, and they barely change, just quietly existing while centuries pass them by. Their secret to extreme longevity? Glacial patience, deep-sea stillness, and a lifestyle that redefines "low-maintenance".

Age: technically… infinite

This tiny jellyfish, no bigger than a fingernail—less than 0.2 inches—is like the ocean’s very own Benjamin Button. What makes it truly extraordinary is its ability to rewind its life story, flipping back to a youthful, juvenile stage whenever it wants. While it’s not completely invincible (predators and other threats are still very real), if left undisturbed, it can keep hitting the reset button on aging indefinitely, making it one of the most fascinating "time-benders" in nature.

Record age: 507 years

In 2006, a special clam was discovered buried deep in the seabeds of the North Atlantic. Scientists were able to determine that it had been there since at least 1499—that’s centuries before the United States was even a thought! This ancient marvel, nicknamed "Ming", was able to perfect a slow-and-steady approach to life. Growing at a snail’s pace and barely budging, Ming’s sedentary lifestyle turned out to be a brilliant strategy for beating the clock. Who knew doing almost nothing could be the ultimate secret to longevity?

Record age: estimated 392 years

These sharks aren’t your average ocean cruisers—they can stretch over 20 feet long and weigh up to 2,200 pounds. But what’s really mindblowing is how slowly they move, like they’re in a permanent state of deep relaxation. Living in the icy Arctic waters, these giants don’t hit adulthood until they’re about 150 years old, and some can glide through the depths for nearly 400 years. Imagine that! These ancient swimmers were already around before America declared independence... and they are still out there, silently roaming the seas!

Record age: over 211 years

This whale is a true ocean giant, stretching up to 60 feet long and weighing a staggering 200,000 pounds. But what makes it stand out isn’t just its size but its age. Some of these majestic creatures carry harpoons from the 1800s still lodged in their skin, like walking history books. Just picture living so long that you’re literally carrying outdated technology embedded in your body—talk about being a time traveler of the seas!

Record age: 200 years

Spanning the chilly Pacific coastline from California all the way up to Alaska, this spiky little ball—about 7 inches across—is full of surprises. It munches on algae and calls the deep, dark ocean its home, thriving at depths of up to 300 feet. Don’t let its size fool you: this prickly creature is a true elder of the cold seas, quietly outliving many ocean neighbors while keeping a low profile. A tough, slow-living veteran wrapped in spikes!

Record age: 226 years

Meet Hanako, a legendary Japanese koi who swam through life for an astonishing 226 years. Scientists discovered how old she was by studying the rings on her scales, much like counting the growth rings of a tree. These colorful, ornamental fish aren’t just symbols of good fortune; they’re also secret long-lifers with the potential to celebrate over two centuries of birthdays, as long as they get the right care and a peaceful pond to call home.

Record age: 190 years

Jonathan is a male tortoise living on the remote island of Saint Helena in the South Atlantic Ocean. He was born back in 1832, and he’s still happily chomping lettuce and soaking up the sun today. Weighing in at more than 400 pounds and measuring around 3 feet long, Jonathan holds the title of the oldest known living land animal on the planet. If he could share tales, they’d span nearly two centuries of history. Imagine that!

Record age: 152 years

This ancient-looking fish, with its whisker-like barbels, looking like a tiny underwater submarine, prowls the lakes of North America. It can reach an impressive length of up to 7 feet and weigh around 200 pounds. These slow-living creatures don’t rush into adulthood—they start breeding only around age 20—and then take their time cruising through life at a leisurely pace. Believe it or not, one legendary catch in Wisconsin was estimated to be over 150 years old!

Record age: over 90 years

This chunky, night-loving parrot from New Zealand is a true oddball—it can’t fly, snores like a grumpy grandpa, and smells like fresh flowers. Despite its quirks, this bird boasts an impressively long lifespan. Sadly, it teeters on the edge of extinction. The oldest known kakapo, affectionately named Richard Henry, lived 90 years, earning him the title of the charmingly eccentric elder statesman of the avian world.

Record age: 37 years

This tiny, kooky rodent—barely 3 inches long and just over an ounce in weight—could’ve been cast straight from a sci-fi apocalypse flick. Dwelling in vast underground colonies across Africa, it’s practically invincible to cancer, pain, and the usual effects of aging. Scientists are fascinated by this little marvel, even if it’s not winning beauty contests anytime soon. Its superpowers make it a star in longevity research!

Record age: estimated 100+ years

Lobsters have a totally different rulebook than us when it comes to aging. They don’t really grow old; they just keep getting bigger and bigger. Some giant lobsters weigh over 40 pounds and stretch beyond 3 feet long. Their biggest threats? Not old age, but predators or the risky process of shedding their shells. In theory, they could live forever if left alone—but let’s be honest, not many get to enjoy a peaceful, lobster-sized retirement!