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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Excessive alcohol use costs the country approximately $235 billion every year.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.