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Vaccines prevent between 2.5 and 4 million deaths every year.
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The human body produces and destroys 15 million blood cells every second.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.