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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.