The human sigh acts as a physiological reset button.
23
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The skin on your lips is 200 times more sensitive than your fingertips.
345
The average sperm cell swims at 8 inches per hour.
76
The human brain is more active during sleep than during the day.
28
Wearing headphones for an hour increases the bacteria in your ear 700 times.
233
It is possible to go blind from smoking too heavily.
50
In 1996, research found that having excessive body hair is linked to higher intelligence.
23