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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.