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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.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.