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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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More than 4.4billion prescriptions were dispensed within the United States in 2016.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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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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