Obsessive nose picking is called Rhinotillexomania.
101
Enamel is hardest substance in the human body.
61
If the human eye was a digital camera, it would have 576 megapixels.
25
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
You can't tickle yourself.
29