Text: Salt water chlorination is a process that uses dissolved salt (2,500--6,000 ppm) as a store for the chlorination system. The chlorine generator (also known as salt cell, salt generator, salt chlorinator or SWG) uses electrolysis in the presence of dissolved salt (NaCl) to produce hypochlorous acid (HClO) and sodium hypochlorite (NaClO), which are the sanitizing agents already commonly used in swimming pools. As such, a saltwater pool is not actually chlorine-free; it simply utilizes added salt and a chlorine generator instead of direct addition of chlorine.

Question: can you use chlorine in a saltwater pool?

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Answer: yes

Text: ''Single Ladies (Put a Ring on It)'' was written by Beyonce, Terius ''The-Dream'' Nash, Thaddis ''Kuk'' Harrell, and Christopher ''Tricky'' Stewart, and was produced by Nash and Stewart. Beyonce recorded the song in May 2008 at the Boom Boom Room Studio in Burbank, California, and it was mixed by Jaycen Joshua and Dave Pensado, with assistance from Randy Urbanski and Andrew Wuepper. Nash conceptualized ''Single Ladies'' after Beyonce's secret marriage to hip hop recording artist Jay-Z in April 2008. Stewart commented that the song was ''the only public statement that (Beyonce and Jay-Z had) ever made about marriage'', and that while in the studio recording the song Beyonce had remained tightlipped, even to the point of removing her wedding band. Beyonce's marriage inspired Nash to compose a song about an issue that affected many people's relationships: the fear or unwillingness of men to commit. In an interview with Billboard magazine, Beyonce added that she was drawn to the song because of the universality of the topic, an issue that ''people are passionate about and want to talk about and debate''. She stated that although ''Single Ladies'' is a playful uptempo song, it addresses an issue that women experience every day.

Question: was beyonce married when single ladies was released?

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Answer: yes

Text: Members of the public may own sporting rifles and shotguns, subject to licensing, but handguns were effectively banned after the Dunblane school massacre in 1996 with the exception of Northern Ireland. Dunblane was the UK's first and only school shooting. There has been one spree killing since Dunblane, the Cumbria shootings in June 2010, which involved a shotgun and a .22 caliber rifle, both legally-held. Prior to Dunblane though, there had only been one mass shooting carried out by a civilian in the entire history of Great Britain, which took place in Hungerford on 19 August 1987.

Question: is it illegal to own a gun in england?

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Answer: no

Text: Superfecundation is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers. The term superfecundation is derived from fecund, meaning the ability to produce offspring. Heteropaternal superfecundation refers to the fertilization of two separate ova by two different fathers. Homopaternal superfecundation refers to the fertilization of two separate ova from the same father, leading to fraternal twins. While heteropaternal superfecundation is referred to as a form of atypical twinning, genetically, the twins are half siblings. Superfecundation, while rare, can occur through either separate occurrences of sexual intercourse or through artificial insemination.

Question: can a woman produce twins of different fathers?

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Answer:
no