Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
93
Pain travels through the body at 350 feet per second!
23
Smokers get ten times more wrinkles than non-smokers.
171
A person can live without food for about a month, but only about a week without water.
156
Scientists estimate that laughing 100 times is equivalent to a 10-minute workout on a rowing machine.
202
During a typical human life span, the human heart will beat approximately 2.5 billion times.
21
Human thigh bones are stronger than concrete!
63