Did you know? It takes 7 seconds for food to pass from mouth to stomach. A human hair can hold 3kg. The length of a man's penis is 3 times the length of his thumb. The femur is as hard as concrete. A woman's heart beats faster than a man's. Women blink 2 times as often as men. We use 200 muscles to keep out balance when we stand. A woman has read this entire text. A man is still looking at his thumb.