The world's shortest man measures only 21.5 inches.
73
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
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
The human body contains over a billion miles of DNA.
147
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Gorillas can catch human colds and other illnesses.
205
Your fingernails grow faster in summer.
744