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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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