Yawns are more contagious among people with closer relationships.
163
Gorillas can catch human colds and other illnesses.
205
In one day, adult lungs move about 10,000 litres of air.
11
On average a woman has 4 sexual partners in her lifetime.
-143
The average person will go on a date at least 100 times before they finally marry.
33
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
24