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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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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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Cyanide works by making the human body unable to use oxygen.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.