Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Smokers get ten times more wrinkles than non-smokers.
171
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
You inhale about 700,000 of your own skin flakes each day.
29
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
Obsessive nose picking is called Rhinotillexomania.
101
Chewing gum boosts your brain power.
285