It takes about 20 seconds for a red blood cell to circle the whole body.
102
When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
Yawns are more contagious among people with closer relationships.
163
Every year your body replaces 98% of your atoms.
119
The human body contains over a billion miles of DNA.
147
Chewing gum boosts your brain power.
285
Your body is creating and killing about 2.4 million red blood cells per second.
17