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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).