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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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.