The average person's skin weighs twice as much as their brain.
131
The average sperm cell swims at 8 inches per hour.
4
The human brain is more active during sleep than during the day.
28
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.
34
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111