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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are 60,000 miles of blood vessels in every adult human.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.