It takes 7 seconds for food to pass from mouth to stomach. A human hair can hold 3kg. The length of a p***s is 3 times the length of the thumb. The femur is as hard as concrete. A womans heart beats faster than a man's. Women blink twice as much as men. We use 300 muscles just to keep our balance. A woman has read this entire post. A man is still looking at his thumb.