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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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The average office desk has 400 times more bacteria on it than a toilet.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.