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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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The longest a person has survived after a heart transplant is 24 years.

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By definition, when a medication is administered intravenously, its bioavailability is 100%.

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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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