A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
We blink 25 times a minute.
51
Human teeth are almost as hard as rocks!
47
Only 1% of bacteria cause disease.
45
Every hour one billion cells in the body must be replaced.
17
"Fish odor syndrome" is a rare genetic disorder that causes people to smell like rotten fish.
5
A study in the UK states that men need at least two "guys nights out" each week to stay healthy.
5