Question: Detroit's protracted decline has resulted in severe urban decay and thousands of empty buildings around the city. Some parts of Detroit are so sparsely populated that the city has difficulty providing municipal services. The city has considered various solutions, such as demolishing abandoned homes and buildings; removing street lighting from large portions of the city; and encouraging the small population in certain areas to move to more populated locations. While some have estimated 20,000 stray dogs roam the city, studies have shown the true number to be around 1,000-3,000. Roughly half of the owners of Detroit's 305,000 properties failed to pay their 2011 tax bills, resulting in about $246 million in taxes and fees going uncollected, nearly half of which was due to Detroit; the rest of the money would have been earmarked for Wayne County, Detroit Public Schools, and the library system.
Try to answer this question if possible: How many stray dogs do studies suggest are in Detroit?
Answer: 1,000-3,000
Question: In Argentina, the most representative Carnival performed is the so-called Murga, although other famous Carnivals, more like Brazil's, are held in Argentine Mesopotamia and the North-East. Gualeguaychú in the east of Entre Ríos province is the most important Carnival city and has one of the largest parades. It adopts a musical background similar to Brazilian or Uruguayan Carnival. Corrientes is another city with a Carnival tradition. Chamame is a popular musical style. In all major cities and many towns throughout the country, Carnival is celebrated.
Try to answer this question if possible: What is Chamame?
Answer: popular musical style.
Question: In the late 1980s, key breakthroughs in GaN epitaxial growth and p-type doping ushered in the modern era of GaN-based optoelectronic devices. Building upon this foundation, Dr. Moustakas at Boston University patented a method for producing high-brightness blue LEDs using a new two-step process. Two years later, in 1993, high-brightness blue LEDs were demonstrated again by Shuji Nakamura of Nichia Corporation using a gallium nitride growth process similar to Dr. Moustakas's. Both Dr. Moustakas and Mr. Nakamura were issued separate patents, which confused the issue of who was the original inventor (partly because although Dr. Moustakas invented his first, Dr. Nakamura filed first).[citation needed] This new development revolutionized LED lighting, making high-power blue light sources practical, leading to the development of technologies like BlueRay, as well as allowing the bright high resolution screens of modern tablets and phones.[citation needed]
Try to answer this question if possible: Who first invented a method to produce high-brightness blue LEDs?
Answer: Dr. Moustakas
Question: According to the Primary Chronicle, the territories of the East Slavs in the 9th century were divided between the Varangians and the Khazars. The Varangians are first mentioned imposing tribute from Slavic and Finnic tribes in 859. In 862, the Finnic and Slavic tribes in the area of Novgorod rebelled against the Varangians, driving them "back beyond the sea and, refusing them further tribute, set out to govern themselves." The tribes had no laws, however, and soon began to make war with one another, prompting them to invite the Varangians back to rule them and bring peace to the region:
Try to answer this question if possible: In what year did the Slavic and Finnic tribes rebel againts the Varangians?
Answer:
862