Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Vaccines prevent between 2.5 and 4 million deaths every year.
Checking teeth and other physical examinations are an important part of horse care.
How to solve a linear system with three unknowns using substitution (Question 2 of 2)