Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The human brain is more active during sleep than during the day.
28
It takes approximately 12 hours for food to entirely digest.
93
On average a woman has 4 sexual partners in her lifetime.
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Yawns are more contagious among people with closer relationships.
163
Mushrooms are more closely related to humans than they are to plants.
47
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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