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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.