It takes about 20 seconds for a red blood cell to circle the whole body.
102
One human hair can support 3 ounces.
191
The average person's skin weighs twice as much as their brain.
131
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Gorillas can catch human colds and other illnesses.
205
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human brain is more active during sleep than during the day.
28
Research has determined that most people are happiest at 7:26pm on a Saturday night.
70