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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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There are approximately 3 million unintended pregnancies in the United States each year.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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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.