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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
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The average adult has about 21 square feet of skin.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.