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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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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.