It takes about 20 seconds for a red blood cell to circle the whole body.
102
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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Human hair and fingernails continue to grow after death.
7
One human hair can support 3 ounces.
191
Poor eyesight (myopia) is associated with higher IQ.
232
The average person's skin weighs twice as much as their brain.
131