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High Quality Content by WIKIPEDIA articles! In geometry, a sphere packing is an arrangement of non-overlapping spheres within a containing space. The spheres considered are usually all of identical size, and the space is usually three-dimensional Euclidean space. However, sphere packing problems can be generalised to consider unequal spheres, n-dimensional Euclidean space (where the problem becomes circle packing in two dimensions, or hypersphere packing in higher dimensions) or to non-Euclidean spaces such as hyperbolic space.

High Quality Content by WIKIPEDIA articles! Tailings, also called mine dumps, slimes, tails, leach residue, or slickens, are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are distinct from overburden or waste rock, which are the materials overlying an ore or mineral body that are displaced during mining without being processed.

High Quality Content by WIKIPEDIA articles! P.A.O.K. Thessaloniki B.C. is the professional basketball department of the Greek multi-sports club P.A.O.K., originally founded in 1926 and is based in Thessaloniki, Greece. The club has established a firm reputation in Greek sports, especially for its success in European leagues. The club has maintained a presence in the Greek First Division (A1 Ethniki) since the year 1960.

High Quality Content by WIKIPEDIA articles! Neo-Marxism is a loose term for various twentieth-century approaches that amend or extend Marxism and Marxist theory, usually by incorporating elements from other intellectual traditions, such as: critical theory, psychoanalysis or Existentialism (in the case of Sartre).

High Quality Content by WIKIPEDIA articles! Pink is a mixture of red and white. Commonly used for Valentine`s Day and Easter, pink is sometimes referred to as "the color of love." The use of the word for the color known today as pink was first recorded in the late 17th century.

High Quality Content by WIKIPEDIA articles! In homological algebra and algebraic topology, a spectral sequence is a means of computing homology groups by taking successive approximations. Spectral sequences are a generalization of exact sequences, and since their introduction by Jean Leray (1946), they have become an important research tool, particularly in homotopy theory.

High Quality Content by WIKIPEDIA articles! Spectral methods are a class of techniques used in applied mathematics and scientific computing to numerically solve certain Dynamical Systems, often involving the use of the Fast Fourier Transform. Where applicable, spectral methods have excellent error properties, with the so called "exponential convergence" being the fastest possible. Spectral methods were developed in a long series of papers by Steven Orszag starting in 1969 including, but not limited to, Fourier series methods for periodic geometry problems, polynomial spectral methods for finite and unbounded geometry problems, pseudospectral methods for highly nonlinear problems, and spectral iteration methods for fast solution of steady...

High Quality Content by WIKIPEDIA articles! Pan Am Railways, Inc. (PAR), known as Guilford Rail System (GRS) before March 2006, is a holding company that owns and operates Class II regional railroads covering northern New England from Mattawamkeag, Maine to Rotterdam Junction, New York. The primary subsidiaries of Pan Am Railways are Boston and Maine Corporation (reporting mark BM), Maine Central Railroad Company (reporting mark MEC), Portland Terminal Company (reporting mark PTM), and Springfield Terminal Railway Company (reporting mark ST); BM and MEC are operated under lease by ST.

High Quality Content by WIKIPEDIA articles! In the branch of mathematics known as topology, the specialization (or canonical) preorder is a natural preorder on the set of the points of a topological space. For most spaces that are considered in practice, namely for all those that satisfy the T0 separation axiom, this preorder is even a partial order (called the specialization order). On the other hand, for T1 spaces the order becomes trivial and is of little interest.

High Quality Content by WIKIPEDIA articles! Pickling, also known as brining or corning is the process of preserving food by anaerobic fermentation in brine (a solution of salt in water) to produce lactic acid, or marinating and storing it in an acid solution, usually vinegar (acetic acid). The resulting food is called a pickle. This procedure gives the food a salty or sour taste. In South Asia, edible oils are used as the pickling medium with vinegar.

High Quality Content by WIKIPEDIA articles! T Symmetry is the symmetry of physical laws under a time reversal transformation:

High Quality Content by WIKIPEDIA articles! The National Enterprise Board (NEB) was a UK government body.

High Quality Content by WIKIPEDIA articles! The physical layer or layer 1 is the first and lowest layer in the seven-layer OSI model of computer networking. The implementation of this layer is often termed PHY.

High Quality Content by WIKIPEDIA articles! An analgesic (also known as a painkiller) is any member of the group of drugs used to relieve pain (achieve analgesia). The word analgesic derives from Greek an- ("without") and algos ("pain").

High Quality Content by WIKIPEDIA articles! In general, reliability (systemic def.) is the ability of a person or system to perform and maintain its functions in routine circumstances, as well as hostile or unexpected circumstances.

High Quality Content by WIKIPEDIA articles! A petition is a request to do something, most commonly addressed to a government official or public entity. Petitions to a deity are a form of prayer.