10 'facts' everyone believes that aren't actually true

• Some common "facts" that everybody knows aren't actually true.
• Although it has been proved that The Great Wall of China is not visible from space, many textbooks haven't caught up to the new information.
• Other facts, like that cracking your knuckles causes arthritis aren't true but became known to stop people from certain activities.

There are some facts that everybody just knows. Maybe none of us can remember where we first heard it, but it definitely wasn't from a textbook. These facts become such a part of pop culture because they're just weird enough to be true, but with a little research, turns out they're totally false.

Here are the facts you've accepted as true all your life that are actually false.

A penny dropped from the top of the Empire State Building will kill you.

On Mythbusters, the scientists determined that a penny "traveling at terminal velocity cannot penetrate concrete or asphalt." It won't cause serious damage to a person, and even at the speed of sound, will still not damage flesh. At most, it could sting a little.

You can see The Great Wall of China from space.

NASA confirms that The Great Wall of China "frequently billed as the only man-made object visible from space" can't actually be seen from the final frontier. Although the fact was debunked by Chinese astronaut, Yang Liwei, the textbooks were never changed, and will often still claim this as true.

Cracking your knuckles will give you arthritis.

This was probably told to you by people who can't stand the sound of bones popping, cracking your knuckles or other body parts will not give your arthritis. Dr. Robert Klapper, an orthopedic surgeon at Cedars-Sinai Medical Center and co-director of their Joint Replacement Program, explained on the hospital's site that there is no harm to cracking your knuckles. "The noise of cracking or popping in our joints is actually nitrogen bubbles bursting in our synovial fluid," he wrote. "It does not lead to arthritis."