For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
There's 100 trillion good bacteria living in your body.
17
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
In 1996, research found that having excessive body hair is linked to higher intelligence.
23
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127