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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.