A comprehensive digital encyclopedia presenting factual, historical, and educational articles supported by reliable sources and structured data. Page: 214

The Allegheny Observatory is an American astronomical research institution, a part of the Department of Physics and Astronomy at the University of Pittsburgh. The facility is listed on the National Register of Historic Places (ref. # 79002157, added June 22, 1979) and is designated as a Pennsylvania…

In geometry, a polygon (/ˈpɒlɪɡɒn/) is a plane figure made up of line segments connected to form a closed polygonal chain.…

In mathematics, a fractal is a geometric shape containing detailed structure at arbitrarily small scales, usually having a fractal dimension strictly exceeding the topological dimension. Many fractals appear similar at various scales, as illustrated in successive magnifications of the Mandelbrot set…

Issuer is a legal entity that develops, registers, and sells securities for the purpose of financing its operations.…

Action Learning is an approach to problem solving that involves taking action and reflecting upon the results. This method is purported to help improve the problem-solving process and simplify the solutions developed as a result. The theory of Action Learning and its epistemological position were or…

Monetary economics is the branch of economics that studies the nature, role, and impact of money and monetary institutions. It provides a framework for analyzing money and its core functions—as a medium of exchange, a store of value, and a unit of account—and examines how money can achieve widesprea…

Science fiction (often shortened to sci-fi or abbreviated SF) is the genre of speculative, science-based fiction that imagines advanced and futuristic scientific or technological progress. The elements of science fiction have evolved over time: from space exploration, extraterrestrial life, time tra…

A tram (also known as a streetcar or trolley in Canada and the United States, or a Tramcar) is an urban rail transit type in which vehicles, whether individual railcars or multiple-unit trains, run on tramway tracks on urban public streets; some include segments on segregated right-of-way. Trams are…

David Ferris Ellison (born January 9, 1983) is an American film producer, media proprietor, and former actor serving as chairman and chief executive officer (CEO) of Paramount Skydance since August 2025. He is the son of Oracle Corporation co-founder Larry Ellison.…

On defense in gridiron football, a pass rush is charging across the line of scrimmage towards the quarterback in an effort to stop or "sack" him. The purpose is tackling, hurrying or flushing the quarterback out of his protective pocket or the play's design.…