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Prandtl
German physicist, considered the father of aerodynamics. He taught at the Univ. of G\u00f6 ttingen 1904-53. His 1904 discovery of the boundary layer at the surface of a body moving in air or water led to an understanding of skin friction drag and of the way streamlining (see streamline) reduces the drag of airplane wings and other moving bodies. His work on wing theory explained the process of airflow over airplane wings.
Pravda
(Russian: "Truth") Former daily newspaper published in Moscow and distributed nationwide, the official organ of the Communist Party of the Soviet Union 1918-91. It was founded in St. Petersburg as an underground paper by V. Lenin and two colleagues in 1912. As a Soviet state newspaper and organ of information and education, it offered well-written articles and analyses on science, economics, cultural topics, and literature as well as materials to indoctrinate and inform readers on Communist theory and programs. International relations was largely left to the government paper Izvestiya. After Communist power ended in 1991, most of its readership evaporated; it became the voice of the conservative-nationalist opposition and ceased publication in 1996.
price
Amount of money that has to be paid to acquire a given good, service, or resource. Operating as a measure of value, prices perform a significant economic function, distributing the scarce supply of goods, services, and resources to those who most want them through the adjustments of supply and demand. Prices of resources are called wages, interest, and rent. This system, known as the price mechanism, is based on the principle that only by allowing prices to move freely will the supply of any given commodity match demand. If supply is excessive, prices will be low and production will be reduced; this will cause prices to rise until there is a balance of demand and supply. If supply is inadequate, prices will be high, prompting an increase in production that in turn will lead to a reduction in prices until supply and demand are in equilibrium. A totally free price mechanism does not exist in practice; even in free-market economies, monopolies or government regulation may limit the efficiency of price as a determinant of supply and demand. In centrally planned economies, the price mechanism may be supplanted by centralized government control. Attempts to operate an economy without a price mechanism usually result in surpluses of unwanted goods, shortages of desired products, black markets, and stunted economic growth.
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