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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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There are approximately 3 million unintended pregnancies in the United States each year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.