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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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There are more bacteria in your mouth than there are people in the world.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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).