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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The average adult has about 21 square feet of skin.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.