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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.