Problem: Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 has the distinction of being the only naturally occurring fissile isotope. Uranium-238 is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239 in a nuclear reactor. Another fissile isotope, uranium-233, can be produced from natural thorium and is also important in nuclear technology. While uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons, uranium-235 and to a lesser degree uranium-233 have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction. This generates the heat in nuclear power reactors, and produces the fissile material for nuclear weapons. Depleted uranium (238U) is used in kinetic energy penetrators and armor plating.
Along with uranium-235, what isotope is noted for having a high fission cross-section for slow neutrons?
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Answer: uranium-233


Problem: In The New Yorker music critic Jody Rosen described Beyoncé as "the most important and compelling popular musician of the twenty-first century..... the result, the logical end point, of a century-plus of pop." When The Guardian named her Artist of the Decade, Llewyn-Smith wrote, "Why Beyoncé? [...] Because she made not one but two of the decade's greatest singles, with Crazy in Love and Single Ladies (Put a Ring on It), not to mention her hits with Destiny's Child; and this was the decade when singles – particularly R&B singles – regained their status as pop's favourite medium. [...] [She] and not any superannuated rock star was arguably the greatest live performer of the past 10 years." In 2013, Beyoncé made the Time 100 list, Baz Luhrmann writing "no one has that voice, no one moves the way she moves, no one can hold an audience the way she does... When Beyoncé does an album, when Beyoncé sings a song, when Beyoncé does anything, it's an event, and it's broadly influential. Right now, she is the heir-apparent diva of the USA — the reigning national voice." In 2014, Beyoncé was listed again on the Time 100 and also featured on the cover of the issue.
Which publication named Beyoncé the Artist of the Decade?
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Answer: The Guardian


Problem: On December 30, 1922, with the creation of the Soviet Union, Russia became one of six republics within the federation of the Union of Soviet Socialist Republics. The final Soviet name for the republic, the Russian Soviet Federative Socialist Republic, was adopted in the Soviet Constitution of 1936. By that time, Soviet Russia had gained roughly the same borders of the old Tsardom of Russia before the Great Northern War of 1700.
In what year was the Great Northern War fought?
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Answer:
1700