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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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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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