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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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There are 60,000 miles of blood vessels in every adult human.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.