Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Every year your body replaces 98% of your atoms.
119
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
Chewing gum boosts your brain power.
285
The human brain doesn't stop developing until about 25 years old.
102
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515