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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.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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People about to have surgery must tell their health care providers about all supplements they take.