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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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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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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.