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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one 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.