You can't tickle yourself.
29
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
The human body contains over a billion miles of DNA.
147
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
29
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197