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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.