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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.