Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Every year your body replaces 98% of your atoms.
119
An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
59
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Chewing gum boosts your brain power.
285
Yawns are more contagious among people with closer relationships.
163
The human brain uses approximately as much energy as a 10 watt light bulb.
120
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99