There are about 1,400 different species of bacteria in your belly button.
10
Research indicates that babies who suck on pacifiers are more prone to ear aches.
21
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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The average sperm cell swims at 8 inches per hour.
4
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
A woman's sense of smell is most sensitive during ovulation.
34
It takes 17 muscles to smile, 43 to frown.
65
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21