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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.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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.