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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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.
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Cyanide works by making the human body unable to use oxygen.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.