In computer science, a binary tree is a tree data structure in which each node has at most two children, which are referred to as the left child and the right child. A recursive definition using just set theory notions is that a (non-empty) binary tree is a tuple, where L and R are binary trees or the empty set and S is a singleton set containing the root. Some authors allow the binary tree to be the empty set as well.
In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as
Snell's law is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.
An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in freshwater or marine water systems, and is often recognized by the discoloration in the water from their pigments. The term algae encompasses many types of aquatic photosynthetic organisms, both macroscopic, multicellular organisms like seaweed and microscopic, unicellular organisms like cyanobacteria. Algal bloom commonly refers to rapid growth of microscopic, unicellular algae, not macroscopic algae. An example of a macroscopic algal bloom is a kelp forest.
Hagfish, of the class Myxini and order Myxiniformes, are eel-shaped, slime-producing marine fish. They are the only known living animals that have a skull but no vertebral column, although hagfish do have rudimentary vertebrae. Along with lampreys, hagfish are jawless; they are the sister group to jawed vertebrates, and living hagfish remain similar to hagfish from around 300 million years ago.
In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity. Although the term is used in the field of optics to describe light and other electromagnetic waves, dispersion in the same sense can apply to any sort of wave motion such as acoustic dispersion in the case of sound and seismic waves, in gravity waves, and for telecommunication signals along transmission lines or optical fiber.
Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.
Slime is a German punk rock band founded in Hamburg in 1979. They were one of the defining bands of the 1980s German punk scene. Musically and lyrically, they developed from simple, straightforward songs in the style of late 70's British punk into complex song structures with layered and cryptic texts. Their anti-fascist messages in particular had an enormous influence on the later Deutschpunk scene; many slogans from their earlier work were adopted in the autonomist scene.
Unterhaltungssoftware Selbstkontrolle is the organisation responsible for video game ratings in Germany. In Austria, it is mandatory in the Salzburg region, while PEGI is mandatory in Vienna, and either system is mandatory in all other regions.
The Federal Review Board for Media Harmful to Minors is an upper-level German federal agency subordinate to the Federal Ministry of Family Affairs, Senior Citizens, Women and Youth. It is responsible for examining and censoring media works suspected to be harmful to young people. When determined they are, these works are entered onto an official list – a process known as Indizierung (indexing) in German as part of child protection efforts. The decision to index a work has a variety of legal implications; chiefly, restrictions on sale and advertisement.
Heinrich Magnus Manske is a senior staff scientist at the Wellcome Trust Sanger Institute in Cambridge, UK and a software developer of one of the first versions of the MediaWiki software, which powers Wikipedia.
The Pacific hagfish is a species of hagfish. It lives in the mesopelagic to abyssal Pacific ocean, near the ocean floor. It is a jawless fish and has a body plan that resembles early paleozoic fish. They are able to excrete prodigious amounts of slime in self-defense.
American rapper T.I. has released eleven studio albums, one compilation album, one remix album, four extended plays (EPs), 13 mixtapes, 110 singles and 11 promotional singles. He has also released one music video album and over 60 music videos, the details of which are included in his videography. Throughout his career, T.I.'s music has been released on several record labels, including Artista and Atlantic, as well as his own label imprint, Grand Hustle Records. T.I. has also served as an executive producer for several projects other than his own, including Big Kuntry King's debut My Turn to Eat (2008), B.G.'s Too Hood 2 Be Hollywood (2009), B.o.B's debut The Adventures of Bobby Ray (2010) and Iggy Azalea's debut EP Glory (2012), as well as her debut album The New Classic (2014). In 2005, T.I. had executive produced the soundtrack to the film Hustle & Flow and released the collection through his record label. T.I. is also a noted record producer, having produced several song recordings, a few under the pseudonym T.I.P.. He has also served as a ghostwriter and assisting songwriter, for several artists, such as Bow Wow, Sean "Diddy" Combs, Dr. Dre, Bun B and Keyshia Cole.
Vom Bordstein bis zur Skyline is the debut studio album by German rapper Bushido. It was released on 14 July 2003 by independent label Aggro Berlin. The album was later banned for minors by the Federal Department for Media Harmful to Young Persons due to its controversial lyrics. It was produced by Bushido and DJ Ilan and reached number 88 in the German Media Control Charts.
Wenn der Himmel brennt is the official DVD of Slime. It contains two DVDs with video and audio tracks. The DVD was released in 2003. The records were made between 1978 and 1995. The songs are recorded partly in English.
The advance–decline line is a stock market technical indicator used by investors to measure the number of individual stocks participating in a market rise or fall. As price changes of large stocks can have a disproportionate effect on capitalization weighted stock market indices such as the S&P 500, the NYSE Composite Index, and the NASDAQ Composite index, it can be useful to know how broadly this movement extends into the larger universe of smaller stocks. Since market indexes represent a group of stocks, they do not present the whole picture of the trading day and the performance of the market during this day. Though the market indices give an idea about what has happened during the trading day, advance/decline numbers give an idea about the individual performance of particular stocks.
Metapedia is an online wiki-based encyclopedia, which contains fascist, far-right, white nationalist, white supremacist, anti-feminist, homophobic, Islamophobic, antisemitic, Holocaust-denying, and neo-Nazi points of view. The site describes itself as being an alternative to Wikipedia that focuses on European culture, art, science, philosophy, and politics. It was founded in 2006, initially in a Swedish-language version, by Swedish neo-Nazi publisher Anders Lagerström, who currently heads the project together with Lennart Berg.
NGC 4571 is a spiral galaxy located in the constellation of Coma Berenices that William Herschel thought was Messier 91 in Charles Messier' catalog of deep-sky objects, before nearly two centuries later that object was determined to be the nearby barred spiral galaxy NGC 4548.
Jeffery Lamar Williams, known professionally as Young Thug, is an American rapper, singer, and songwriter. He is considered to be one of the most influential rappers of his generation, with his music having heavily shaped contemporary trap music and inspired numerous artists. Known for his eccentric vocal style and fashion, he first received attention for his collaborations with rappers Birdman and Gucci Mane. Thug initially released a series of independent mixtapes beginning in 2011 with I Came from Nothing. In early 2013, he signed with Gucci Mane's 1017 Records, and later that year he released his label debut mixtape 1017 Thug to critical praise.
The public market equivalent (PME) is a collection of performance measures developed to assess private equity funds and to overcome the limitations of the internal rate of return and multiple on invested capital measurements. While the calculations differ, they all attempt to measure the return from deploying a private equity fund's cash flows into a stock market index.
