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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.