A comprehensive digital encyclopedia presenting factual, historical, and educational articles supported by reliable sources and structured data. Page: 421

In differential geometry, the two principal curvatures at a given point of a surface are the maximum and minimum values of the curvature as expressed by the eigenvalues of the shape operator at that point. They measure how the surface bends by different amounts in different directions at that point.…

Diana Latow Blank (born September 13, 1942) is an American philanthropist who founded the Kendeda Fund. She is the former wife of The Home Depot co-founder, Arthur Blank.…

A shape is a graphical representation of an object's form or its external boundary, outline, or external surface. It is distinct from other object properties, such as color, texture, or material type. In geometry, shape excludes information about the object's position, size, orientation and chiralit…

Wisconsin is a state in the Upper Midwest and Great Lakes regions of the United States. It borders Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. With a population of about 6 million and an ar…

In the lineal kinship system used in the English-speaking world, a niece or nephew is a child of an individual's sibling or sibling-in-law. A niece is female and a nephew is male, and they would call their parents' siblings aunt or uncle. The gender-neutral term nibling has been used in place of the…

The Arctic (/ˈɑːr(k)tɪk/; from Ancient Greek ἄρκτος (árktos) 'bear') is the polar region of Earth that surrounds the North Pole, lying north of the Arctic Circle. The Arctic region, from the IERS Reference Meridian travelling east, consists of parts of northern Norway (Nordland, Troms, Finnmark, Sva…

John Eric Ensign (born March 25, 1958) is an American veterinarian and former politician who served as a United States senator from Nevada from 2001 until his resignation in 2011 amid a Senate Ethics Committee investigation into his attempts to hide an extramarital affair. A member of the Republican…

Cornish (Kernewek or Kernowek [kəɾˈnuːək]) is a Celtic language of the Brittonic subgroup that is native to the Cornish people and their homeland, Cornwall. Along with Welsh and Breton, Cornish descends from Common Brittonic, a language once spoken widely across Great Britain. For much of the mediev…

Adelaide (/ˈædɪleɪd/ AD-il-ayd; Kaurna: Tarndanya [ˈd̪̥aɳɖaɲa]) is the capital and most populous city of South Australia, as well as the fifth-most populous city in Australia. The name "Adelaide" may refer to either Greater Adelaide (including the Adelaide Hills) or the Adelaide city centre; the dem…

Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles. It is a subfield of physics and electrical engineering which uses active devices such a…