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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

Cyanobacteria of the (a) genus Synechococcus form (b) mats that line hot springs around the world. Cyanobacteria of the (a) genus Synechococcus form (b) mats that line hot springs around the world.
Continuous, Absorption Line, and Emission Line Spectra Continuous, Absorption Line, and Emission Line Spectra
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Video: DNA fingerprinting Animation

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