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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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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.