Human teeth are almost as hard as rocks!
47
10 seconds is the amount of time until unconsciousness after the loss of blood supply to the brain.
108
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
22
If you unfolded your brain, it would cover an ironing board.
42
There's 100 trillion good bacteria living in your body.
17
A man once sued his doctor because he survived his cancer longer than the doctor predicted.
74