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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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.
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There are more sensory neurons in the tongue than in any other part of the body.