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Author Question: Nitrous oxide is a ________, odorless gas in its natural state. A. passive C. colorless B. ... (Read 14 times) |
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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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.