Article: A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.

Question: What happens when sunlight shines on a solar balloon?
Ans: the air inside is heated and expands causing an upward buoyancy force


Here is a question about this article: Only one 5.1 surround sound option exists on a given LaserDisc (either Dolby Digital or DTS), so if surround sound is desired, the disc must be matched to the capabilities of the playback equipment (LD Player and Receiver/Decoder) by the purchaser. A fully capable LaserDisc playback system includes a newer LaserDisc player that is capable of playing digital tracks, has a digital optical output for digital PCM and DTS audio, is aware of AC-3 audio tracks, and has an AC-3 coaxial output; an external or internal AC-3 RF demodulator and AC-3 decoder; and a DTS decoder. Many 1990s A/V receivers combine the AC-3 decoder and DTS decoder logic, but an integrated AC-3 demodulator is rare both in LaserDisc players and in later A/V receivers.
What is the answer to this question: Are integrated AC-3 demodulators common in LaserDisc players or a rare find?
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So... rare


The problem: Answer a question about this article:
The tradition of presenting the trophy immediately after the game did not start until the 1882 final; after the first final in 1872 the trophy was not presented to the winners, Wanderers, until a reception held four weeks later in the Pall Mall Restaurant in London. Under the original rules, the trophy was to be permanently presented to any club which won the competition three times, although when inaugural winners Wanderers achieved this feat by the 1876 final, the rules were changed by FA Secretary CW Alcock (who was also captain of Wanderers in their first victory).
What happens to multiple cup winners? 
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The answer: the trophy was to be permanently presented to any club which won the competition three times,


Problem: Please answer a question about the following article about Philadelphia:
Before Europeans arrived, the Philadelphia area was home to the Lenape (Delaware) Indians in the village of Shackamaxon. The Lenape are a Native American tribe and First Nations band government. They are also called Delaware Indians and their historical territory was along the Delaware River watershed, western Long Island and the Lower Hudson Valley.[a] Most Lenape were pushed out of their Delaware homeland during the 18th century by expanding European colonies, exacerbated by losses from intertribal conflicts. Lenape communities were weakened by newly introduced diseases, mainly smallpox, and violent conflict with Europeans. Iroquois people occasionally fought the Lenape. Surviving Lenape moved west into the upper Ohio River basin. The American Revolutionary War and United States' independence pushed them further west. In the 1860s, the United States government sent most Lenape remaining in the eastern United States to the Indian Territory (present-day Oklahoma and surrounding territory) under the Indian removal policy. In the 21st century, most Lenape now reside in the US state of Oklahoma, with some communities living also in Wisconsin, Ontario (Canada) and in their traditional homelands.
Where do the Lenape reside today?
A: Oklahoma


Question: Read this and answer the question

Kerry's commanding officer, Lieutenant Commander George Elliott, stated to Douglas Brinkley in 2003 that he did not know whether to court-martial Kerry for beaching the boat without orders or give him a medal for saving the crew. Elliott recommended Kerry for the Silver Star, and Zumwalt flew into An Thoi to personally award medals to Kerry and the rest of the sailors involved in the mission. The Navy's account of Kerry's actions is presented in the original medal citation signed by Zumwalt. The engagement was documented in an after-action report, a press release written on March 1, 1969, and a historical summary dated March 17, 1969.

What was released on March 17, 1969?
Answer: a historical summary


In South Africa, the period of colonization resulted in many unions and marriages between European men and African women from various tribes, resulting in mixed-race children. As the Europeans acquired territory and imposed rule over the Africans, they generally pushed mixed-race and Africans into second-class status. During the first half of the 20th century, the Afrikaaner-dominated government classified the population according to four main racial groups: Black, White, Asian (mostly Indian), and Coloured. The Coloured group included people of mixed Bantu, Khoisan, and European descent (with some Malay ancestry, especially in the Western Cape). The Coloured definition occupied an intermediary political position between the Black and White definitions in South Africa. It imposed a system of legal racial segregation, a complex of laws known as apartheid.
What was a result of these marriages?
mixed-race children