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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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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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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.