Early American humans hunted car-size armadillos and used their shells for houses.
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On average, there's 100 billion neurons in the human brain.
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Your heart will pump about 212 million liters in its lifetime.
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In one day, adult lungs move about 10,000 litres of air.
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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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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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