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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.