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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Growth of yeast cells in culture fits the logistic growth model. Growth of yeast cells in culture fits the logistic growth model.
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The blood–brain barrier. The blood–brain barrier.
Video: Cellular Defects - Osteoblasts, Osteoclasts and Osteocytes

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