The problem: Answer a question about this article:
Lie groups are of fundamental importance in modern physics: Noether's theorem links continuous symmetries to conserved quantities. Rotation, as well as translations in space and time are basic symmetries of the laws of mechanics. They can, for instance, be used to construct simple models—imposing, say, axial symmetry on a situation will typically lead to significant simplification in the equations one needs to solve to provide a physical description.v[›] Another example are the Lorentz transformations, which relate measurements of time and velocity of two observers in motion relative to each other. They can be deduced in a purely group-theoretical way, by expressing the transformations as a rotational symmetry of Minkowski space. The latter serves—in the absence of significant gravitation—as a model of space time in special relativity. The full symmetry group of Minkowski space, i.e. including translations, is known as the Poincaré group. By the above, it plays a pivotal role in special relativity and, by implication, for quantum field theories. Symmetries that vary with location are central to the modern description of physical interactions with the help of gauge theory.
What concept relates measurements of time and velocity of two observers in motion relative to each other?
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The answer: Lorentz transformations


The problem: Answer a question about this article:
Sure South Atlantic Ltd ("Sure") offers television for the island via 17 analogue terrestrial UHF channels, offering a mix of British, US, and South African programming. The channels are from DSTV and include Mnet, SuperSport and BBC channels. The feed signal, from MultiChoice DStv in South Africa, is received by a satellite dish at Bryant's Beacon from Intelsat 7 in the Ku band.
What is the feed signal of Sure South Atlantic received by?
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The answer: a satellite dish


The problem: Answer a question about this article:
Known as the world's automotive center, "Detroit" is a metonym for that industry. Detroit's auto industry, some of which was converted to wartime defense production, was an important element of the American "Arsenal of Democracy" supporting the Allied powers during World War II. It is an important source of popular music legacies celebrated by the city's two familiar nicknames, the Motor City and Motown. Other nicknames arose in the 20th century, including City of Champions, beginning in the 1930s for its successes in individual and team sport; The D; Hockeytown (a trademark owned by the city's NHL club, the Red Wings); Rock City (after the Kiss song "Detroit Rock City"); and The 313 (its telephone area code).
What is Detroit's area code?
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The answer: 313


The problem: Answer a question about this article:
The majority of video compression algorithms use lossy compression. Uncompressed video requires a very high data rate. Although lossless video compression codecs perform at a compression factor of 5-12, a typical MPEG-4 lossy compression video has a compression factor between 20 and 200. As in all lossy compression, there is a trade-off between video quality, cost of processing the compression and decompression, and system requirements. Highly compressed video may present visible or distracting artifacts.
What requires a high data rate?
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The answer:
Uncompressed video