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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.