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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Cyanide works by making the human body unable to use oxygen.

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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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