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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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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

By middle adulthood, most individuals and established and confident in their careers By middle adulthood, most individuals and established and confident in their careers
Prisoners from the front (1866) established Winslow Homer's reputation for spare truthfulness. Prisoners from the front (1866) established Winslow Homer's reputation for spare truthfulness.
Vocational interests seem to be established well before adulthood, and young people of all ages ... Vocational interests seem to be established well before adulthood, and young people of all ages ...
In Hindu marriages, the roles of husband and wife are firmly established. Neither this woman, whom I ... In Hindu marriages, the roles of husband and wife are firmly established. Neither this woman, whom I ...
What will be the pH of the solution once equilibrium is established? What will be the pH of the solution once equilibrium is established?
Twenty percent of the automobiles inspected at a state inspection station required repairs to ... Twenty percent of the automobiles inspected at a state inspection station required repairs to ...
Video: Introduction to Sickle Cell Anemia

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