Your fingernails grow faster in summer.
744
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
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
A person can live without food for about a month, but only about a week without water.
156
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
By weight, Bone is five times stronger than steel.
417
A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
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.
35