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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average office desk has 400 times more bacteria on it than a toilet.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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The human body produces and destroys 15 million blood cells every second.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.