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The horizontal fraction bar was introduced by the Arabs.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.