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HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Biography
Hanna von Hoerner
Hanna von Hoerner (14 November 1942 – 4 July 2014) was a German astrophysicist. She founded the company von Hoerner & Sulger which produces scientific instruments, notably cosmic dust analyzers used on space missions by European Space Agency (ESA) and NASA. Hanna von Hoerner was born in Görlitz in 1942.[1] Her father was the astrophysicist Sebastian von Hoerner.[2] With his help and encour
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  • 15 Nov 2022
Topic Review
Proofs of Fermat's Theorem on Sums of Two Squares
Fermat's theorem on sums of two squares asserts that an odd prime number p can be expressed as with integer x and y if and only if p is congruent to 1 (mod 4). The statement was announced by Girard in 1625, and again by Fermat in 1640, but neither supplied a proof. The "only if" clause is easy: a perfect square is congruent to 0 or 1 modulo 4, hence a sum of two squares is congruent to 0, 1, or 2. An odd prime number is congruent to either 1 or 3 modulo 4, and the second possibility has just been ruled out. The first proof that such a representation exists was given by Leonhard Euler in 1747 and was complicated. Since then, many different proofs have been found. Among them, the proof using Minkowski's theorem about convex sets and Don Zagier's short proof based on involutions have appeared.
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  • 11 Nov 2022
Topic Review
Comparison of High Definition Optical Disc Formats
This article compares the technical specifications of multiple high definition formats, including HD DVD and Blu-ray Disc; two mutually incompatible, high definition optical disc formats that, beginning in 2006, attempted to improve upon and eventually replace the DVD standard. The two formats remained in a format war until February 19, 2008 when Toshiba, HD DVD's creator, announced plans to cease development, manufacturing and marketing of HD DVD players and recorders. Other high-definition optical disc formats were attempted, including the multi-layered red-laser Versatile Multilayer Disc and a Chinese made format called EVD. Both appear to have been abandoned by their respective developers.
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  • 15 Nov 2022
Topic Review
Enterprise JavaBeans
Enterprise JavaBeans (EJB) is one of several Java APIs for modular construction of enterprise software. EJB is a server-side software component that encapsulates business logic of an application. An EJB web container provides a runtime environment for web related software components, including computer security, Java servlet lifecycle management, transaction processing, and other web services. The EJB specification is a subset of the Java EE specification.
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  • 11 Nov 2022
Biography
Simcha Jacobovici
Simcha Jacobovici (/ˈsɪmxə jəˈkoʊboʊvɪtʃ/, born April 4, 1953, Petah Tikva, Israel) is an Israeli-Canadian film director, producer, freelance journalist, and writer. His parents were from Iași, Romania.[1] Simcha Jacobovici earned a B.A. in Philosophy and Political Science (with honors) from McGill University and an M.A. in International Relations from the University of Toronto. He
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  • 15 Nov 2022
Biography
Kenneth D. Cameron
Kenneth Donald Cameron (born November 29, 1949), (Col, USMC, Ret.), is a retired American naval aviator, test pilot, engineer, U.S. Marine Corps officer, and NASA astronaut. Cameron was born November 29, 1949, in Cleveland, Ohio. He graduated from Rocky River High School, Rocky River, Ohio, in 1967. He went on to attend the Massachusetts Institute of Technology, receiving a Bachelor of Scienc
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  • 11 Nov 2022
Biography
William S. McArthur
William Surles McArthur, Jr. (born July 26, 1951) is a retired United States Army colonel and NASA astronaut and a veteran of three Space Shuttle missions and one expedition to the International Space Station via the Russian Soyuz capsule.[1] Born July 26, 1951, and raised in Red Springs, North Carolina, McArthur was active in the Boy Scouts of America where he achieved its second highest ran
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  • 15 Nov 2022
Topic Review
The Sims 3 Stuff Packs
Stuff packs are minor expansion packs for The Sims 3 that add new items, clothing, and furniture to the game without implementing any significant changes to gameplay.
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  • 11 Nov 2022
Topic Review
Plug-In Electric Vehicles in the United Kingdom
The adoption of plug-in electric vehicles in the United Kingdom is actively supported by the British government through the plug-in car and van grants schemes and other incentives. Around 455,000 light-duty plug-in electric vehicles had been registered in the UK up until February 2021, consisting of about 215,000 all-electric vehicles and 240,000 plug-in hybrids. Until 2019, the UK had the second largest European stock of light-duty plug-in vehicles in use after Norway.
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  • 11 Nov 2022
Biography
Elmer William Engstrom
Elmer William Engstrom (August 25, 1901 – October 30, 1984) was an American electrical engineer and corporate executive prominent for his role in the development of television. Engstrom was born in Minneapolis, Minnesota in 1901 as son of Emil Engstrom, a power plant engineer, and Anna (Nelson) Engstrom. After attending the Mechanical Arte High School in Saint Paul, Minnesota, he obtained
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  • 15 Nov 2022
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