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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
The Experiment by Albrecht, 1978
If you want to show differences between items at the same time, a bar graph is more effective than a
Dynamic Response of Thermometers Experiment
Four Possibilities in Judging the Presence or Absence of a Stimulus
Griffith’s transformation experiment
Time Line for Life’s Origin and Evolution