Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
The human brain doesn't stop developing until about 25 years old.
102
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
-137
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Every year your body replaces 98% of your atoms.
119
The average sperm cell swims at 8 inches per hour.
76
When you take a step, you are using up to 200 muscles.
886
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13