You can't tickle yourself.
29
The world's shortest man measures only 21.5 inches.
73
The average person's skin weighs twice as much as their brain.
131
Gorillas can catch human colds and other illnesses.
205
Your thumb is about the same size as your nose.
124
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21