Yawns are more contagious among people with closer relationships.
163
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
The human body contains over a billion miles of DNA.
147
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
Poor eyesight (myopia) is associated with higher IQ.
232
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99