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There are 20 feet of blood vessels in each square inch of human skin.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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