Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
62
If your DNA was stretched out it would reach to the moon 6,000 times.
256
The average person's skin weighs twice as much as their brain.
131
When you take a step, you are using up to 200 muscles.
886
The human body contains over a billion miles of DNA.
147
Poor eyesight (myopia) is associated with higher IQ.
232