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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).
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Approximately 25% of all reported medication errors result from some kind of name confusion.