10 Viral Myths That Seem True… But Aren’t

This idea fascinates us because it suggests that we possess an untapped superpower, as if 90% of our brain were dormant, waiting to be activated.

The reality is less magical, but far more interesting. Each area of the brain has a specific function: memory, language, emotions, coordination… Nothing is left to chance. We don’t use just “10%”; we use it all, just not all regions at the same time.

This myth persists because it appeals to our imagination, but the brain’s true power lies precisely in its complexity and efficiency, not in some hidden potential.

We’ve all heard this urban legend: if you swallow a piece of gum, it will stick to your stomach for seven years. The image is striking, but completely false.

True, gum isn’t digested like regular food, since it’s designed to withstand chewing. But your digestive system knows exactly how to handle this type of material: it simply passes it through and eliminates it within a few days, just like everything else.

There is no risk to your health, unless you swallow absurd amounts of it. A persistent belief… but one without any basis.

This myth persists because, after death, the skin dries out and shrinks, making the hair and nails appear longer. To the naked eye, it looks as though they have grown, when in fact it is merely an optical illusion.

In reality, no growth is possible: without blood circulation, cells can no longer regenerate. Nothing grows, nothing lengthens, nothing continues to “live.”

This misleading phenomenon fuels the collective imagination, but it in no way indicates biological activity. It is merely an illusion, not a sign of life.

People often think that a red cape makes bulls angry, especially because of bullfights. But that’s completely false: bulls don’t perceive red the way we do.

What really upsets them isn’t the color, but the cape’s rapid, aggressive movement. Red was chosen solely for the spectacle, tradition, and… to better hide the blood.

This myth persists because it’s visual and dramatic, but biologically, it doesn’t hold up. The bull reacts to the movement, not the color.

This belief is reassuring, but it is completely false. Lightning does not “choose” a spot and then avoid it: it has no memory.

In reality, lightning very often strikes the same area multiple times, especially when it comes to tall, conductive structures like skyscrapers, antennas, or towers. The Empire State Building, for example, is struck dozens of times every year.

Lightning simply follows the path of least resistance—the one that conducts electricity best. Nothing magical, nothing sentimental: just pure physics.

This idea is amusing because it perfectly explains why goldfish swim endlessly in circles in their tanks. However, it is completely false.

Studies show that goldfish have a much more developed memory than we imagine: they can retain information for several months, recognize their owner, and associate certain gestures with the arrival of food. They even learn routines and respond to specific signals.

Their memory is therefore neither fleeting nor unreliable. This myth persists because it’s convenient… but it doesn’t stand up to scientific scrutiny for a second.

People often think of vitamins as an instant energy boost, a “healthy” alternative to coffee. But that’s completely wrong.

Vitamins don’t work like stimulants: they don’t provide direct energy and have no immediate effect on your fatigue levels. Their role is to help your body in the long term by supporting metabolism, immunity, or cell production.

If you’re looking for a quick boost, you’re better off relying on caffeine, in whatever form you prefer. Vitamins, on the other hand, work over time, not instantly.

Candy and birthday cakes are often linked to sudden hyperactivity, as if sugar instantly turned children into little whirlwinds.

However, studies are clear: there is no direct link between sugar consumption and hyperactivity. What puts children in this state of excitement is mainly the context: friends, games, gifts, the festive atmosphere… in short, everything that makes a birthday party exhilarating.

Sweets are merely supporting actors in this scenario. Sugar isn’t the culprit: it’s the event itself that electrifies the children.

For a long time, people believed that Apple devices were untouchable, as if they were naturally immune to viruses. This is a persistent myth, but it is completely false. No electronic device is invulnerable.

Admittedly, macOS and iOS are targeted less often than Windows, but they remain attractive targets for cybercriminals. Macs, iPhones, and iPads can be infected by malware, phishing, or malicious apps.

Caution is therefore essential: regular updates, best practices, and, yes, antivirus software can be useful even on an Apple device. Absolute security does not exist.

This belief stems from a U.S. military study conducted in the 1950s, which was misunderstood and then repeated for decades. It led people to believe that we lose 80% of our body heat through the head.

In reality, the body loses heat through all exposed areas: hands, feet, ears, the back of the neck… no single area is more prone to heat loss.

If you go outside without a hat but with an open coat, it’s simply the uncovered area that will become the main point of heat loss.

Heat escapes wherever the skin is exposed to the air, not specifically through the head. A persistent but unfounded belief.