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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.