Article: Since ancient times, north Zhejiang and neighbouring south Jiangsu have been famed for their prosperity and opulence[citation needed], and simply inserting north Zhejiang place names (Hangzhou, Jiaxing, etc.) into poetry gave an effect of dreaminess, a practice followed by many noted poets. In particular, the fame of Hangzhou (as well as Suzhou in neighbouring Jiangsu province) has led to the popular saying: "Above there is heaven; below there is Suzhou and Hangzhou" (上有天堂，下有苏杭), a saying that continues to be a source of pride for the people of these two still prosperous cities.

Question: The fame of where led to a popular saying?
Ans: Hangzhou


Article: On 30 October 2009, May wrote a fanclub letter on his website stating that Queen had no intentions to tour in 2010 but that there was a possibility of a performance. He was quoted as saying, "The greatest debate, though, is always about when we will next play together as Queen. At the moment, in spite of the many rumours that are out there, we do not have plans to tour in 2010. The good news, though, is that Roger and I have a much closer mutual understanding these days—privately and professionally ... and all ideas are carefully considered. Music is never far away from us. As I write, there is an important one-off performance on offer, in the USA, and it remains to be decided whether we will take up this particular challenge. Every day, doors seem to open, and every day, we interact, perhaps more than ever before, with the world outside. It is a time of exciting transition in Rock music and in 'The Business'. It's good that the pulse still beats". On 15 November 2009, May and Taylor performed "Bohemian Rhapsody" live on the British TV show The X Factor alongside the finalists.

Question: What date did May and Taylor of Queen perform Bohemian Rhapsody on X-Factor?
Ans: 15 November 2009


Article: For decades, it was the official policy of the Soviet Union to deny the existence of the secret protocol to the Soviet–German Pact. At the behest of Mikhail Gorbachev, Alexander Nikolaevich Yakovlev headed a commission investigating the existence of such a protocol. In December 1989, the commission concluded that the protocol had existed and revealed its findings to the Congress of People's Deputies of the Soviet Union. As a result, the Congress passed the declaration confirming the existence of the secret protocols, condemning and denouncing them. Both successor-states of the pact parties have declared the secret protocols to be invalid from the moment they were signed. The Federal Republic of Germany declared this on September 1, 1989 and the Soviet Union on December 24, 1989, following an examination of the microfilmed copy of the German originals.

Question: Which states have argued that the Soviet-German Pact was invalid from the inception?
Ans: Both successor-states of the pact parties


Article: Among the challenges being faced to improve the efficiency of LED-based white light sources is the development of more efficient phosphors. As of 2010, the most efficient yellow phosphor is still the YAG phosphor, with less than 10% Stoke shift loss. Losses attributable to internal optical losses due to re-absorption in the LED chip and in the LED packaging itself account typically for another 10% to 30% of efficiency loss. Currently, in the area of phosphor LED development, much effort is being spent on optimizing these devices to higher light output and higher operation temperatures. For instance, the efficiency can be raised by adapting better package design or by using a more suitable type of phosphor. Conformal coating process is frequently used to address the issue of varying phosphor thickness.

Question: What is the percentage of stoke shift loss in YAG phosphor?
Ans:
less than 10%