Yawns are more contagious among people with closer relationships.
163
You can't tickle yourself.
29
Obsessive nose picking is called Rhinotillexomania.
101
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
On average a woman has 4 sexual partners in her lifetime.
-143
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
73
If your DNA was stretched out it would reach to the moon 6,000 times.
256