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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Everyone has one nostril that is larger than the other.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.