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Vaccines prevent between 2.5 and 4 million deaths every 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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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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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Cyanide works by making the human body unable to use oxygen.