It is not possible to tickle yourself. The cerebellum, a part of the brain, warns the rest of the brain that you are about to tickle yourself. Since your brain knows this, it ignores the resulting sensation.

The only 15 letter word that can be spelled without repeating a letter is "uncopyrightable."

Ticks can be as small as a grain of rice and grow to be as big as a marble.

A M A Z I N G   F A C T S