Yawns are more contagious among people with closer relationships.
163
Enamel is hardest substance in the human body.
61
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
It takes about 20 seconds for a red blood cell to circle the whole body.
102
All 13 minerals necessary for human life can be found in alcohol beverages.
282