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
In older people, memory is best early in the morning and then declines during the late afternoon.
33
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
The average person who stops smoking requires one hour less sleep a night.
79
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine.
202
Smoking while pregnant increases the chances of spontaneous abortions (miscarriages) stillbirths and premature labor.
77
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23