City

A city is a large and populated urban area. It is typically larger and more populous than a town, and it is generally organized around a central business district. Cities are often centers of culture, commerce, education, and government, and they are usually the home of a diverse range of people and industries. Cities are typically the hub of a larger metropolitan area, which is a region that includes the city and its surrounding suburbs. Some examples of famous cities include New York City, London, and Paris.

James Webb Space Telescope

NASA created the James Webb Space Telescope with support from the European Space Agency and the Canadian Space Agency. The telescope is named after James E. Webb, who served as NASA administrator from 1961 to 1968 and was instrumental in the Apollo program. JWST’s primary mirror, the Optical Telescope Element, consists of 18 hexagonal mirror

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Electrolyte

When an electrolyte is dissolved in a polar solvent, such as water, it generates an electrically conducting solution. The electrolyte dissolves and splits into cations and anions, which scatter evenly across the solvent. Such a solution is electrically neutral. When an electric potential is introduced to such a solution, the cations are pulled to the

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Paris

Paris is France’s capital city, occupying an area of more than 105 square kilometers. The City of Paris is the administrative and political hub of the area and province of Île-de-France, also known as the Paris Region.

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4-velocity

4 velocity is a four-vector whose elements are given by the contravariant expression {\displaystyle U^{\mu }={\frac {dx^{\mu }}{d\tau }}} where {\displaystyle \tau } is the proper time. For special relativity an inertial frame observer finds the proper time from his own coordinate time {\displaystyle t} and the coordinate speed {\displaystyle u} of the thing being observed by {\displaystyle dt={\frac {d\tau }{\sqrt {1-{\frac {u^{2}}{c^{2}}}}}}=\gamma d\tau

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Berlin

Berlin is Germany’s capital and largest city in terms of both area and population. Berlin, one of Germany’s sixteen component states, is surrounded by the State of Brandenburg and is next to Potsdam, the capital of Brandenburg. Berlin’s urban area, with a population of roughly 4.5 million people, is Germany’s second most populated urban region

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