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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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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.

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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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On average, the stomach produces 2 L of hydrochloric acid per day.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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