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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Cyanide works by making the human body unable to use oxygen.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.