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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The human body produces and destroys 15 million blood cells every second.
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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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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.