The average sperm cell swims at 8 inches per hour.
76
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
The levels of two stress hormones, cortisol and epinephrine which suppress the body's immune system, will actually drop after a dose of laughter.
112
Your heart will pump about 212 million liters in its lifetime.
26
Your thumb is about the same size as your nose.
124
In ancient Egypt, priests plucked EVERY hair from their bodies, including their eyebrows and eyelashes.
130
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
There are about 1,400 different species of bacteria in your belly button.
10