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The human body produces and destroys 15 million blood cells every second.
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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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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.