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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

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

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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