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.
21
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Clinophobia is the fear of beds!
30
In older people, memory is best early in the morning and then declines during the late afternoon.
33
The human brain is insensitive to pain.
76
Chewing gum boosts your brain power.
285
Human hair and fingernails continue to grow after death.
7
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197