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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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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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The average adult has about 21 square feet of skin.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.