There are so many "facts" that we repeat time and again, without ever examining whether or not there's any truth behind them.
You can't go swimming after eating. Sharks can smell blood miles away. Dogs can't see colors.
All of these are so well-known that nearly everyone has heard of them. What's more, they're all false.
Many people drop food on the floor, pick it up immediately, and eat it — arguing that no bacteria can adhere to it within five seconds.
This just isn't true. Food can pick up bacteria nearly instantly, meaning there's no such thing as a safe duration for eating food that's been dropped.
There's a belief that foods high in preservatives, like fast food or snack cakes, basically last forever without spoiling.
In fact, McDonald's burgers go bad within a day. They might not obviously rot if they're kept in dry, cold conditions, but that doesn't mean they're safe to eat.
An unfortunate urban legend, this one was unfortunately started by a Disney film crew that wanted to create a more dramatic scene.
They marched scores of lemmings off a cliff, giving rise to a false belief that has persisted for decades.
Evolution is a constant, meaning that other apes have been evolving just as we have.
What does that mean? It means that we didn't come from chimps or gorillas or monkeys — all species came from a common ape ancestor that no longer exists.
The myth that sharks can't get cancer was started by a guy trying to sell shark cartilage as a cancer treatment.
Scientists have actually observed cancer in various shark species over the years — more than enough to debunk the claims.
Sticking with the shark beat, let's debunk the myth that sharks can smell blood from miles away.
The ocean is big, and although sharks have a keen sense of smell, they can smell blood from a few hundred yards away — not miles.
No, that heart-shaped box of chocolates isn't likely to make anyone more amorous.
The long-held myth never needed to be debunked, because there was never really any scientific evidence to support it in the first place.
We've been conditioned to think that our pets see in black and white, but that isn't exactly true.
Both cats and dogs see better in low-light situations, and also see in different spectrums, with colors appearing differently than they do to us.
There's an old myth that the Wall is the only human-made object visible from the moon.
You can see it from low-orbiting satellites like the International Space Station, but the same is true of many objects. From the moon, the narrow wall is completely invisible, however.
There's a popular myth that humans only use a certain, small percentage of their brain.
Different parts of the brain are used for different things, but we still use all of our brain. Brain stuff uses up a fifth of the body's energy.
The mountain is definitely the tallest above sea level, but it isn't technically the tallest mountain on Earth.
That honor goes to the Hawaiian island of Mauna Kea. Factoring in the submerged section of the volcanic island, it's 33,500 feet tall — about a mile taller than Everest.
It may cost more, but that doesn't mean it's pesticide-free or even better for you. Organic crops are often sprayed with "natural" pesticides.
What's more, experts have found that organic food doesn't have any nutritional benefits that non-organic doesn't.
The vast Sahara may be our planet's most famous desert, but it isn't the biggest.
The biggest desert actually spans a whole continent. Antarctica, at 5.4 million square miles, is just as dry and much bigger than the 3.6 million square mile Sahara.
Sure, spacewalking astronauts may appear to float, but their body weight is still real.
Being in orbit basically means an object is falling forever around an object, and that object's gravity continually slingshots them around it, causing them to continue "falling."
No, swimming after eating isn't going to make anyone cramp up and drown.
It's unclear where this myth came from, but there's absolutely zero evidence to support it. Swim away!
