For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
Every year your body replaces 98% of your atoms.
119
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
One human hair can support 3 ounces.
191
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
Poor eyesight (myopia) is associated with higher IQ.
232
The human body contains over a billion miles of DNA.
147