When you look up at the blue sky and see white dots flying around, you’re actually seeing your own white blood cells.
30
If your stomach didn't produce a new layer of mucous every two weeks, it would digest itself.
33
A toothbrush within 6 feet of a toilet can get airborne bacteria from flushing.
15
Fingernails grow fastest on the hand you favor.
44
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
It is almost impossible to sneeze with your eyes open. It is a defense mechanism that has evolved to protect our eyes from bacteria and debris.
164
You have no sense of smell when you're sleeping!
72
It takes about 20 seconds for a red blood cell to circle the whole body.
102