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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.