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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).
The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.