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Did you know?
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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Illicit drug use costs the United States approximately $181 billion every year.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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