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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.