Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
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.
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The average person will go on a date at least 100 times before they finally marry.
33
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Obsessive nose picking is called Rhinotillexomania.
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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