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Author Question: A . Addition equation: 9 + 4 = 3 + ______ b. Subtraction equation: 41 - 6 = 50 - ______ c. Mixed ... (Read 148 times) |
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Thyroid conditions may make getting pregnant impossible.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.