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Persepolis

(Encyclopedia)Persepolis pərsĕpˈəlĭs [key] [Gr.,=city of Persia], ancient city of Persia, ceremonial capital of the Achaemenid empire under Darius I and his successors. The administrative capitals were elsewhe...

molting

(Encyclopedia)molting, periodical shedding and renewal of the outer skin, exoskeleton, fur, or feathers of an animal. In most animals the process is triggered by secretions of the thyroid and pituitary glands. Near...

von Sydow, Max

(Encyclopedia)von Sydow, Max, 1929–2020, Swedish actor, b. Carl Adolf von Sydow. He worked with director Ingmar Bergman at the Malmö Municipal Theatre (1955–60) before moving to Stockhom and joining the Royal ...

Food and Drug Administration

(Encyclopedia)Food and Drug Administration (FDA), agency of the Public Health Service division of the U.S. Department of Health and Human Services. It is charged with protecting public health by ensuring that foods...

foot-and-mouth disease

(Encyclopedia)foot-and-mouth disease or hoof-and-mouth disease, highly contagious disease almost exclusive to cattle, sheep, swine, goats, and other cloven-hoofed animals. It is caused by a virus, specifically an a...

rock carvings and paintings

(Encyclopedia)rock carvings and paintings, designs inscribed on rock surfaces and huge stone monuments in many parts of the world by prehistoric or preindustrial peoples. They have been found on every continent and...

perfluoroalkyl and polyfluoroalkyl substances

(Encyclopedia)perfluoroalkyl and polyfluoroalkyl substances (PFAS), a group of several thousand synthetic organic chemical compounds made up of a chain of carbon atoms bonded to fluorine atoms. PFAS, which resist w...

monsters and imaginary beasts

(Encyclopedia)monsters and imaginary beasts. The mythologies and legends of ancient and modern cultures teem with an enormous variety of monsters and imaginary beasts. A great number of these are composites of diff...

São Tomé and Principe

(Encyclopedia)CE5 São Tomé and Principe prēnˈsēpə [key], officially Democratic Republic of São Tomé and Principe, republic (2015 est. pop. 196,000), 372 sq mi (964 sq km), W Africa, in the Gulf of Guinea...

physical education and training

(Encyclopedia)physical education and training, organized instruction in motor activities that contribute to the physical growth, health, and body image of the individual. The historical roots of physical education ...