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Everyone has one nostril that is larger than the other.

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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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In 2006, a generic antinausea drug named ondansetron was approved. It is used to stop nausea and vomiting associated with surgery, chemotherapy, and radiation therapy.

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

A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f
A diagrammatic section through a typical adult tooth. A diagrammatic section through a typical adult tooth.
Indicators of Economic Development Indicators of Economic Development
Cradle the head briefly in both hands to end this section. Cradle the head briefly in both hands to end this section.
Diencephalon: Sagittal section, medial view Diencephalon: Sagittal section, medial view
A transmission electron micrograph of cytokinesis in a cross section of a dividing cell A transmission electron micrograph of cytokinesis in a cross section of a dividing cell
Video: Bond types - Atomic structure and basis of bonds

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