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Author Question: Optical fibers are made from hair-thin threads of A) marble. B) glass. C) asbestos. D) ... (Read 33 times) |
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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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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.