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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.