In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Q: The Keo Nua Pass in this country is one of the few passes through the Annamese Cordillera (CORE-dee-YARE-uh). This nation's capital includes the Temple of the Trung Sisters and is located on the Red River. The imperial citadel of Dai Noi is found in this country's onetime capital Hue (hway). For 10 points, name this Southeast Asian nation that was reunified in 1975 after a bloody war between the communist north and U.S.-aligned south.

A: Social Science
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Q: Two female members of this occupation served under John Rackham and were named Mary Read and Anne Bonny. Members of this profession could gain government support if granted a Letter of Marque, which made them privateers. In this occupation's Golden Age, Bartholomew Roberts had the most success, and that age also saw the likes of (*) Edward Teach and William Kidd. For 10 points, name this profession that got the majority of its members from the ships it robbed, and whose captains included Blackbeard and whose ships flew the Jolly Roger.

A: History
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Q: Different versions of this phenomenon have been experimentally tested by Ives and Stilwell on hydrogen atoms in 1938. Cherenkov radiation and verification of the absence of a medium of transmission for light are important consequences of its relativistic formulation. Johannes Stark predicted that high velocity rays of positive ions will demonstrate it, while Buys-Ballot [BOYS-ba-LOH] first verified it in 1845. First described by an Austrian scientist in 1842, FTP, name this effect that explains why a moving observer perceives a wavelength different from the source wavelength.

A:
Science
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