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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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There are 20 feet of blood vessels in each square inch of human skin.

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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 ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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