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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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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.