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 adult human brain weighs about 3 pounds (1,300-1,400 g).
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Your thumb is about the same size as your nose.
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The largest cell in the human body is the female egg and the smallest is the male sperm.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Our Right Lungs takes more air than our left lung.
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