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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Your heart beats over 36 million times a year.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.