Tigers can see 6 times better at night than humans.
305
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
Yawns are more contagious among people with closer relationships.
163
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24
Only humans shed emotional tears.
331
The world's shortest man measures only 21.5 inches.
73
In one day, adult lungs move about 10,000 litres of air.
11
