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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.