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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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).
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The horizontal fraction bar was introduced by the Arabs.
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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.