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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).
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.