Enamel is hardest substance in the human body.
61
When you take a step, you are using up to 200 muscles.
886
Every year your body replaces 98% of your atoms.
119
The human brain has the capacity to store everything that you experience.
4k
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
55
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193