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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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The average adult has about 21 square feet of skin.

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