Your heart will pump about 212 million liters in its lifetime.
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The human brain doesn't stop developing until about 25 years old.
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One human hair can support 3 ounces.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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Yawns are more contagious among people with closer relationships.
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The human eye blinks an average of 4,200,000 times a year.
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We share 70% of our DNA with a slug.
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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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