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Illicit drug use costs the United States approximately $181 billion every year.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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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.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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