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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.
The average adult has about 21 square feet of skin.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.