Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
On average, there's 100 billion neurons in the human brain.
83
Due to the angle at which the optic nerve enters the brain, staring at a blue surface during sex greatly increases the intensity of orgasms.
252
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
A man's beard grows fastest when he anticipates sex.
239