6. It's dangerous to wake up a sleepwalker.
Sure, your sleepwalking friend might get startled when you wake them up, but that doesn’t mean it’s actually dangerous for you to do so. In fact, it’s probably more dangerous if you notice them sleepwalking and don’t wake them up. Who knows where they’d end up if you didn’t shake them awake.
7. Your fingerprints are one-of-a-kind.
In 1888, physician Henry Faulds wrote an article that said that each person’s fingerprints are 100 percent unique. And while fingerprints are still used today as evidence in criminal investigations, we actually have no way to prove that each of our fingerprints is unlike any other person’s. It’s simply impossible.
In fact, there are 22 known cases of fingerprint mistakes in the history of the American legal system.
8. The ability to roll your tongue is genetic.
In 1940, a geneticist claimed that the ability to roll your tongue was determined by your genetics. A mere 12 years later, that theory was disproven by another (smarter) geneticist. In a study of 33 sets of identical twins, seven of the pairs had one twin who could roll their tongue and one twin who couldn’t. But their genes were the same. So clearly, the ability to roll one’s tongue is not based on your genes. Yet the myth persists.
9. We only have five senses.
And no, the sixth one isn’t “seeing dead people.” Scientists estimate that humans have between 22 and 33 senses, some of which include a sense of balance, sense of temperature, sense of pain, and sense of thirst.
It’s true; we are much more complex and interesting than we’re told when we’re growing up.
10. It takes seven years for your body to digest swallowed chewing gum.
Gum may not be digestible, but that doesn’t mean it can’t pass through your digestive tract. Therefore, the idea that it takes seven years for your body to digest a piece of swallowed gum is a total myth. The human body is capable of passing objects up to the size of a quarter, so unless you wadded up 10 pieces of gum and accidentally swallowed a giant gum mass, you should pass it just fine.