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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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There are 60,000 miles of blood vessels in every adult human.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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).