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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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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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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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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Hairy ears: a phenotype proposed to be Y linked Hairy ears: a phenotype proposed to be Y linked
Transmission of sex-linked disorders. Transmission of sex-linked disorders.
Some X-linked Recessive Traits Some X-linked Recessive Traits
Plot of the percentage of X-linked recessive mutations Plot of the percentage of X-linked recessive mutations
X-Linked Recessive Pattern X-Linked Recessive Pattern
Morgan’s analysis of genetic linkage of X-linked genes for eye color Morgan’s analysis of genetic linkage of X-linked genes for eye color
Video: Mechanics of Sound Animation

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