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The horizontal fraction bar was introduced by the Arabs.
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The human body produces and destroys 15 million blood cells every second.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.