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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are more bacteria in your mouth than there are people in the world.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.