The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Your body is creating and killing about 2.4 million red blood cells per second.
17
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Poor eyesight (myopia) is associated with higher IQ.
232
Chewing gum boosts your brain power.
285
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515