You can't tickle yourself.
29
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The human sigh acts as a physiological reset button.
23
A man's beard grows fastest when he anticipates sex.
239
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
On average, there's 100 billion neurons in the human brain.
83