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Did you know?
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
Did you know?
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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The horizontal fraction bar was introduced by the Arabs.
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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.