Question: Bitumen was used in early photographic technology. In 1826 or 1827, it was used by French scientist Joseph Nicephore Niepce to make the oldest surviving photograph from nature. The bitumen was thinly coated onto a pewter plate which was then exposed in a camera. Exposure to light hardened the bitumen and made it insoluble, so that when it was subsequently rinsed with a solvent only the sufficiently light-struck areas remained. Many hours of exposure in the camera were required, making bitumen impractical for ordinary photography, but from the 1850s to the 1920s it was in common use as a photoresist in the production of printing plates for various photomechanical printing processes.[not in citation given]
Try to answer this question if possible: What did exposure to light harden and make soluble?
Answer: unanswerable
Question: Annual summer events include the Electronic Music Festival, International Jazz Festival, the Woodward Dream Cruise, the African World Festival, the country music Hoedown, Noel Night, and Dally in the Alley. Within downtown, Campus Martius Park hosts large events, including the annual Motown Winter Blast. As the world's traditional automotive center, the city hosts the North American International Auto Show. Held since 1924, America's Thanksgiving Parade is one of the nation's largest. River Days, a five-day summer festival on the International Riverfront lead up to the WindsorDetroit International Freedom Festival fireworks, which draw super sized-crowds ranging from hundreds of thousands to over three million people.
Try to answer this question if possible: Which festival spans five days?
Answer: River Days
Question: In 1173 John's elder brothers, backed by Eleanor, rose in revolt against Henry in the short-lived rebellion of 1173 to 1174. Growing irritated with his subordinate position to Henry II and increasingly worried that John might be given additional lands and castles at his expense, Henry the Young King travelled to Paris and allied himself with Louis VII. Eleanor, irritated by her husband's persistent interference in Aquitaine, encouraged Richard and Geoffrey to join their brother Henry in Paris. Henry II triumphed over the coalition of his sons, but was generous to them in the peace settlement agreed at Montlouis. Henry the Young King was allowed to travel widely in Europe with his own household of knights, Richard was given Aquitaine back, and Geoffrey was allowed to return to Brittany; only Eleanor was imprisoned for her role in the revolt.
Try to answer this question if possible: Who was imprisoned?
Answer: Eleanor
Question: In 1995 the National Lottery granted money for a 4.6m sports complex, to add to Eton's existing facilities of two swimming pools, 30 cricket squares, 24 football, rugby and hockey pitches and a gym. The College paid 200,000 and contributed 4.5 hectares of land in return for exclusive use of the facilities during the daytime only. The UK Sports Council defended the deal on the grounds that the whole community would benefit, while the bursar claimed that Windsor, Slough and Eton Athletic Club was "deprived" because local people (who were not pupils at the College) did not have a world-class running track and facilities to train with. Steve Osborn, director of the Safe Neighbourhoods Unit, described the decision as "staggering" given the background of a substantial reduction in youth services by councils across the country, a matter over which, however, neither the College nor the UK Sports Council, had any control. The facility, which became the Thames Valley Athletics Centre, opened in April 1999.
Try to answer this question if possible: How many swimming pools are located within Eton?
Answer:
two