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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.