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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.