The average person's skin weighs twice as much as their brain.
131
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Yawns are more contagious among people with closer relationships.
163
Human hair and fingernails continue to grow after death.
7
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111