Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Enamel is hardest substance in the human body.
61
Every year your body replaces 98% of your atoms.
119
The human brain uses approximately as much energy as a 10 watt light bulb.
120
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
The average person's skin weighs twice as much as their brain.
131
If your DNA was stretched out it would reach to the moon 6,000 times.
256