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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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

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

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