Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The average sperm cell swims at 8 inches per hour.
4
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Only humans shed emotional tears.
331
A human being loses an average of 40 to 100 strands of hair a day.
133
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
The human eye blinks an average of 4,200,000 times a year.
233
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