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 human brain doesn't stop developing until about 25 years old.
102
There are about 1,400 different species of bacteria in your belly button.
10
The average person's skin weighs twice as much as their brain.
131
A human being loses an average of 40 to 100 strands of hair a day.
133
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515