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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 average adult has about 21 square feet of skin.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.