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π Wikimedia Foundation v. NSA
Wikimedia Foundation, et al. v. National Security Agency, et al. is a lawsuit filed by the American Civil Liberties Union (ACLU) on behalf of the Wikimedia Foundation and several other organizations against the National Security Agency (NSA), the United States Department of Justice (DOJ), and other named individuals, alleging mass surveillance of Wikipedia users carried out by the NSA. The suit claims the surveillance system, which NSA calls "Upstream", breaches the First Amendment to the United States Constitution, which protects freedom of speech, and the Fourth Amendment to the United States Constitution, which prohibits unreasonable searches and seizures.
The suit was filed in the United States District Court for the District of Maryland as the NSA is based in Fort Meade, Maryland. The suit was dismissed in October 2015 by Judge T. S. Ellis III; this decision was appealed four months later to the Fourth Circuit Court of Appeals by the Wikimedia Foundation. The Court of Appeals found that the dismissal was valid for all of the plaintiffs except the Foundation, whose allegations the court found "plausible" enough to have legal standing for the case to be remanded to the lower court.
The original plaintiffs besides the Wikimedia Foundation were the National Association of Criminal Defense Lawyers, Human Rights Watch, Amnesty International USA, the PEN American Center, the Global Fund for Women, The Nation magazine, the Rutherford Institute, and the Washington Office on Latin America.
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- "Wikimedia Foundation v. NSA" | 2018-07-27 | 19 Upvotes 3 Comments
π Many-valued logic
In logic, a many-valued logic (also multi- or multiple-valued logic) is a propositional calculus in which there are more than two truth values. Traditionally, in Aristotle's logical calculus, there were only two possible values (i.e., "true" and "false") for any proposition. Classical two-valued logic may be extended to n-valued logic for n greater than 2. Those most popular in the literature are three-valued (e.g., Εukasiewicz's and Kleene's, which accept the values "true", "false", and "unknown"), the finite-valued (finitely-many valued) with more than three values, and the infinite-valued (infinitely-many-valued), such as fuzzy logic and probability logic.
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- "Many-valued logic" | 2019-06-14 | 106 Upvotes 81 Comments
π Hofmeister Kink
The Hofmeister kink (sometimes also translated Hofmeister kick, German: Hofmeister-Knick) is an automotive design feature seen on modern BMWs and automobiles by other manufacturers. The feature consists of a low forward bend at the C-pillar or D-pillar in the case of touring vehicles or SUVs. It is named for Wilhelm Hofmeister, BMW design chief from 1955-1970.
Among the first cars to feature this design trait were some 1949 General Motors 2-door cars, as well as the 1958 Lancia Flaminia Sport Zagato and the 1961 Lancia Flavia CoupΓ©. Despite its being used broadly across automotive makes, the term "Hofmeister kink" is generally used in reference to automobiles designed by BMW it later appeared in.
The first BMWs to feature it were the BMW 3200 CS and the BMW 1500 shown at the Frankfurt Motor Show in September 1961 and was later named after then-BMW director of design, Wilhelm Hofmeister. In early models, the widened base of the C-pillar sometimes featured the BMW roundel.
Apart from its stylistic effect, the Hofmeister kink is said by BMW to suggest that all BMW models have rear-wheel drive (or all-wheel drive biased to the rear).
Not unique to BMW models, similar C-pillar kinks have appeared on cars of other brands both before 1961 and since. For example, the 1951 Kaiser Deluxe Golden Dragon shows a considerable "Hofmeister kink" in its greenhouse design. Another instance is seen with the 1994 Chevrolet Impala SS, based on the 1991+ Chevrolet Caprice, which had a plastic C-pillar kink insert and unique quarter window added to its design for its debut year. For 1994, the Caprice retained the standard triangular shaped window glass. In 1995, GM did away with the plastic insert, and incorporated this kink into the stamped sheetmetal quarter panels themselves for both the Impala SS as well as the Caprice Classic. In addition, the kink is present on some Honda Accord and Civic models.
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- "Hofmeister Kink" | 2019-07-14 | 49 Upvotes 23 Comments
π Pink Noise
Pink noise or β1βf noise is a signal or process with a frequency spectrum such that the power spectral density (energy or power per frequency interval) is inversely proportional to the frequency of the signal. In pink noise, each octave (halving or doubling in frequency) carries an equal amount of noise energy.
Pink noise is one of the most common signals in biological systems.
The name arises from the pink appearance of visible light with this power spectrum. This is in contrast with white noise which has equal intensity per frequency interval.
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- "Pink Noise" | 2019-09-27 | 10 Upvotes 4 Comments
π Hy
Hy (alternately, Hylang) is a programming language, a dialect of the language Lisp designed to interact with the language Python by translating expressions into Python's abstract syntax tree (AST). Hy was introduced at Python Conference (PyCon) 2013 by Paul Tagliamonte.
Similar to Kawa's and Clojure's mapping of s-expressions onto the Java virtual machine (JVM), Hy is meant to operate as a transparent Lisp front end to Python's abstract syntax. Lisp allows operating on code as data (metaprogramming). Thus, Hy can be used to write domain-specific languages. Hy also allows Python libraries, including the standard library, to be imported and accessed alongside Hy code with a compiling step converting the data structure of both into Python's AST.
π Rules of Play
Rules of Play: Game Design Fundamentals is a book on game design by Katie Salen and Eric Zimmerman, published by MIT Press.
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- "Rules of Play" | 2019-01-21 | 55 Upvotes 8 Comments
π Add oil
"Add oil" is a Hong Kong English expression used as an encouragement and support to a person. Derived from the Chinese phrase Gayau (or Jiayou; Chinese: ε ζ²Ή), the expression is literally translated from the Cantonese phrase. It is originated in Hong Kong and is commonly used by bilingual Hong Kong speakers.
"Add oil" can be roughly translated as "Go for it". Though it is often described as "the hardest to translate well", the literal translation is the result of Chinglish and was added to the Oxford English Dictionary in 2018.
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- "Add oil" | 2023-12-05 | 64 Upvotes 28 Comments
π Sand Cat
The sand cat (Felis margarita), also known as the sand dune cat, is the only cat living chiefly in true deserts. This small cat is widely distributed in the deserts of North Africa, the Middle East and Central Asia. Starting in 2002, it was listed as near threatened on the IUCN Red List because the population was considered fragmented and small with a declining trend. It was downlisted to least concern in 2016.
Owing to long hairs covering the soles of its feet, the sand cat is well adapted to the extremes of a desert environment and tolerant of extremely hot and cold temperatures. It inhabits both sandy and stony deserts, in areas far from water sources.
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- "Sand Cat" | 2015-12-02 | 47 Upvotes 15 Comments
π Lambda Cube
In mathematical logic and type theory, the Ξ»-cube is a framework introduced by Henk Barendregt to investigate the different dimensions in which the calculus of constructions is a generalization of the simply typed Ξ»-calculus. Each dimension of the cube corresponds to a new kind of dependency between terms and types. Here, "dependency" refers to the capacity of a term or type to bind a term or type. The respective dimensions of the Ξ»-cube correspond to:
- y-axis (): terms that can bind types, corresponding to polymorphism.
- x-axis (): types that can bind terms, corresponding to dependent types.
- z-axis (): types that can bind types, corresponding to (binding) type operators.
The different ways to combine these three dimension yield the 8 vertices of the cube, each corresponding to a different kind of typed system. The Ξ»-cube can be generalized into the concept of a pure type system.
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- "Lambda Cube" | 2019-03-05 | 139 Upvotes 53 Comments
π A Physical instance of recursion, from 1936
Bourton-on-the-Water model village is a scale model village in the grounds of the Old New Inn in Bourton-on-the-Water, Gloucestershire, England. One of the first model villages in the country, it was started in 1936 and completed in 1940. The model represents the core of Bourton-on-the-Water as it appeared in 1936 in 1:9 scale. The model village contains around 100 buildings. It is open to the public and includes exhibitions of other models on smaller scales.
The Bourton-on-the-Water model village was one of the first to be built in England, being completed between 1936 and 1940. Possibly the only earlier example is the Bekonscot model village in Beaconsfield, Buckinghamshire, which is the oldest in the world, being begun in 1929, though not finished until the later 20th century. Bourton-on-the-Water was a fledgling tourist destination in the early 20th century and the landlord of the New Inn, Mr C A Morris, decided to build the model village to attract motorists to his public house. Morris had originally intended to convert the pub's vegetable garden into a village green with a stream with a waterfall and scale replicas of the arch bridges in the village. He soon decided to instead construct a 1:9 scale model of the entire village.
Morris and his wife carefully measured each building in the village and commissioned eight local craftsmen to construct scale replicas of around 100 structures. The craftsmen were construction workers rather than model makers so the methods used were scaled down versions of those used to construct real buildings. The walls are made from ashlars of local limestone, carefully cut to minimise joints and engraved to depict smaller courses of stone. The roofs are covered with slates of Cotswold stone from the Huntsman's Quarry located 3 miles (4.8Β km) from the village. The drystone walls are real and have cock and hen or flatstone copings to correspond with the real walls in the village. Two of the buildings have full interiors, visible through perspex panels in their walls: the Church of England parish church of St Lawrence and the village's Baptist chapel. The church has intricate tracery windows and the windows on the models are glazed with real glass. The model village includes examples of 17th- to 19th-century Cotswold architecture. A recording of hymns being sung is played from the village's churches. The roads include model benches and post boxes. Miniature shrubs, including some bonsai trees planted in the 1930s, and pruned real trees represent the trees and bushes of the full-size village and alpine plants the flowers.
The model village covers the core of the historic village stretching from the Old Mill (now home to the Cotswold Motoring Museum) to the New Inn (which is now known as the Old New Inn). This includes High Street, Station Road, Moore Road, Victoria Street and Sherborne Street. The only building not shown in its correct relative position is St Lawrence's church, which would otherwise fall outside of the area covered. A running stream stands in for the River Windrush.
The model village includes a scale model of the model village (which would be at 1:81 scale). This model, in turn, contains a scale model of the model of the model village; being at 1:729 scale this measures around 1 foot (30Β cm) in width. This model also contains a scale model (in paint only) of the model of the model of the model village (which would be at 1:6561 scale).
The model village opened to the public on 13 May 1937, as part of the celebrations for the coronation of George VI. The model village was the first tourist attraction in Bourton-on-the-Water; the village has since become one of the main tourist destinations in the Cotswolds. Construction of the models continued until 1940. No significant changes to the architecture have been made since, so the model village preserves Bourton-on-the-Water as it was in 1936, except that shop logos and window displays are updated to reflect changing occupants.
The Morris family maintained and operated the site until 1999 when the model village and the Old New Inn were sold to Julian and Vicki Atherton. In 2004 they purchased a collection of 30 miniature scenes that had been on display in a shop in the village; these form a separate exhibition. The model village became a grade II listed building on 22 March 2013, receiving the same protection as the early 18th-century Old New Inn, which was listed in 1983. In 2014 the Athertons bought a collection of seven 1:32 scale model buildings. These had been built by John Constable in Somerset, part funded by philanthropist Sir Paul Getty. They included a representation of Willy Lott's Cottage, the building depicted in John Constable's The Hay Wain. The collection, out of scale with the model village, were opened as a separate exhibition at the site. In 2016 when renovations were made to the roof of the St Lawrence's Church model, a penny dated 1937 was recovered, which is believed to indicate the date of its construction.
During the Athertons' ownership the village attracted around 100,000 visitors per year and was open every day except Christmas Day. The buildings remain outdoors all year round, while some model villages close in the winter when the models are put into storage. The Athertons employed a full time stone mason to repair damage caused by frost as well as three other employees to repaint the models and maintain the trees and bushes.
In April 2018 the Old New Inn and model village were put up for sale as the Athertons retired. The pub and model village were purchased by Andrew and Julie Lund-Yates, who had lived in Bourton-on-the-Water for 25 years.
- Droste effect known in art as an example of mise en abyme
- Official website
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- "A Physical instance of recursion, from 1936" | 2024-07-20 | 29 Upvotes 9 Comments