Yawns are more contagious among people with closer relationships.
163
When you take a step, you are using up to 200 muscles.
886
One human hair can support 3 ounces.
191
Every year your body replaces 98% of your atoms.
119
The human body contains over a billion miles of DNA.
147
All the chemicals in a human body combined are worth about 6.25 euro (if sold separately).
266
The average sperm cell swims at 8 inches per hour.
76