Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Only humans shed emotional tears.
331
On average, there's 100 billion neurons in the human brain.
83
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
Human hair and fingernails continue to grow after death.
7
A human being loses an average of 40 to 100 strands of hair a day.
133
Mushrooms are more closely related to humans than they are to plants.
47
Every human spent about half an hour as a single cell.
144