Your heart will pump about 212 million liters in its lifetime.
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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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Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
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The average person's skin weighs twice as much as their brain.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
190
One human hair can support 3 ounces.
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After age 30, the brain begins to lose about 50,000 neurons per day - shrinking the brain .25% each year.
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