On average, there's 100 billion neurons in the human brain.
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Crying literally alleviates stress and uniquely allows humans to decrease feelings of anger and sadness.
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Your fingernails grow faster in summer.
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It takes approximately 12 hours for food to entirely digest.
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If your DNA was stretched out it would reach to the moon 6,000 times.
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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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