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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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There are more bacteria in your mouth than there are people in the world.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.