For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
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
If you are cold you are more likely to be hungry because you use energy to keep warm.
143
A human being loses an average of 40 to 100 strands of hair a day.
133
If your DNA was stretched out it would reach to the moon 6,000 times.
256
Within three days of death, the enzymes that once digested your food begin to eat you.
22