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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.