Article: Chopin arrived in Paris in late September 1831; he would never return to Poland, thus becoming one of many expatriates of the Polish Great Emigration. In France he used the French versions of his given names, and after receiving French citizenship in 1835, he travelled on a French passport. However, Chopin remained close to his fellow Poles in exile as friends and confidants and he never felt fully comfortable speaking French. Chopin's biographer Adam Zamoyski writes that he never considered himself to be French, despite his father's French origins, and always saw himself as a Pole.

Question: What biographer of Chopin wrote that Chopin never considered himself French?
Ans: Adam Zamoyski

Article: In December 2011, Xinhua stated that "[t]he basic structure of the Beidou system has now been established, and engineers are now conducting comprehensive system test and evaluation. The system will provide test-run services of positioning, navigation and time for China and the neighboring areas before the end of this year, according to the authorities." The system became operational in the China region that same month. The global navigation system should be finished by 2020. As of December 2012, 16 satellites for BeiDou-2 have been launched, 14 of them are in service.

Question: When is it projected that the global navigation system will be finished?
Ans: by 2020

Article: Both Rousseau and Locke's social contract theories rest on the presupposition of natural rights, which are not a result of law or custom, but are things that all men have in pre-political societies, and are therefore universal and inalienable. The most famous natural right formulation comes from John Locke in his Second Treatise, when he introduces the state of nature. For Locke the law of nature is grounded on mutual security, or the idea that one cannot infringe on another's natural rights, as every man is equal and has the same inalienable rights. These natural rights include perfect equality and freedom, and the right to preserve life and property. Locke also argued against slavery on the basis that enslaving yourself goes against the law of nature; you cannot surrender your own rights, your freedom is absolute and no one can take it from you. Additionally, Locke argues that one person cannot enslave another because it is morally reprehensible, although he introduces a caveat by saying that enslavement of a lawful captive in time of war would not go against one's natural rights.

Question: What was John Locke's one exception to denouncing slavery?
Ans: enslavement of a lawful captive in time of war would not go against one's natural rights

Article: There do exist orbits within these empty regions where objects can survive for the age of the Solar System. These resonances occur when Neptune's orbital period is a precise fraction of that of the object, such as 1:2, or 3:4. If, say, an object orbits the Sun once for every two Neptune orbits, it will only complete half an orbit by the time Neptune returns to its original position. The most heavily populated resonance in the Kuiper belt, with over 200 known objects, is the 2:3 resonance. Objects in this resonance complete 2 orbits for every 3 of Neptune, and are known as plutinos because the largest of the known Kuiper belt objects, Pluto, is among them. Although Pluto crosses Neptune's orbit regularly, the 2:3 resonance ensures they can never collide. The 3:4, 3:5, 4:7 and 2:5 resonances are less populated.

Question: What is the resonance of Pluto in the Kuiper belt?
Ans:
2:3