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The horizontal fraction bar was introduced by the Arabs.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.