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Solar hot water systems use sunlight to heat water. In low geographical latitudes (below 40 degrees) from 60 to 70% of the domestic hot water use with temperatures up to 60 °C can be provided by solar heating systems. The most common types of solar water heaters are evacuated tube collectors (44%) and glazed flat plate collectors (34%) generally used for domestic hot water; and unglazed plastic collectors (21%) used mainly to heat swimming pools.
How much hot water can be produced by solar heating systems in low geographical latitudes?
A: 60 to 70% of the domestic hot water

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However, during this period, major figures and artists in the scene began leaning away from underground aesthetics. In the music press, the increasingly esoteric writing of post-punk publications soon began to alienate their readerships; it is estimated that within several years, NME suffered the loss of half its circulation. Writers like Paul Morley began advocating "overground brightness" instead of the experimental sensibilities promoted in early years. Morley's own musical collaboration with engineer Gary Langan and programmer J. J. Jeczalik, the Art of Noise, would attempt to bring sampled and electronic sounds to the pop mainstream. A variety of more pop-oriented groups, including ABC, the Associates, Adam and the Ants and Bow Wow Wow (the latter two managed by former Sex Pistols manager Malcolm McLaren) emerged in tandem with the development of the New Romantic subcultural scene. Emphasizing glamour, fashion, and escapism in distinction to the experimental seriousness of earlier post-punk groups, the club-oriented scene drew some suspicion from denizens of the movement.
Many of the big players in the post-punk scene began leaning away from what as time progressed?
A: underground aesthetics

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Required attendance at school is 10 years for males and 11 years for females (2001). The adult literacy rate is 99.0% (2002). In 2010, there were 1,918 students who were taught by 109 teachers (98 certified and 11 uncertified). The teacher-pupil ratio for primary schools in Tuvalu is around 1:18 for all schools with the exception of Nauti School, which has a teacher-student ratio of 1:27. Nauti School on Funafuti is the largest primary in Tuvalu with more than 900 students (45 percent of the total primary school enrolment). The pupil-teacher ratio for Tuvalu is low compared to the Pacific region (ratio of 1:29).
What si the teacher-student ratio for Tuvalu schools?
A: 1:18

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Carpet-weaving is historically a major traditional profession for the majority of Armenian women, including many Armenian families. Prominent Karabakh carpet weavers there were men too. The oldest extant Armenian carpet from the region, referred to as Artsakh (see also Karabakh carpet) during the medieval era, is from the village of Banants (near Gandzak) and dates to the early 13th century. The first time that the Armenian word for carpet, gorg, was used in historical sources was in a 1242–1243 Armenian inscription on the wall of the Kaptavan Church in Artsakh.
What is 'gorg'?
A:
the Armenian word for carpet