Human teeth are almost as hard as rocks!
47
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Only 1% of bacteria cause disease in humans!
2
A human being loses an average of 40 to 100 strands of hair a day.
133
Your ears secrete more earwax when you are afraid than when you aren't.
235
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Every hour one billion cells in the body must be replaced.
17

