Problem: Uranium:

In 1972, the French physicist Francis Perrin discovered fifteen ancient and no longer active natural nuclear fission reactors in three separate ore deposits at the Oklo mine in Gabon, West Africa, collectively known as the Oklo Fossil Reactors. The ore deposit is 1.7 billion years old; then, uranium-235 constituted about 3% of the total uranium on Earth. This is high enough to permit a sustained nuclear fission chain reaction to occur, provided other supporting conditions exist. The capacity of the surrounding sediment to contain the nuclear waste products has been cited by the U.S. federal government as supporting evidence for the feasibility to store spent nuclear fuel at the Yucca Mountain nuclear waste repository.

Of what nationality wasn't Perrin?
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A: unanswerable


Problem: Korean War:

Although Kim's early successes had led him to predict that he would end the war by the end of August, Chinese leaders were more pessimistic. To counter a possible U.S. deployment, Zhou Enlai secured a Soviet commitment to have the Soviet Union support Chinese forces with air cover, and deployed 260,000 soldiers along the Korean border, under the command of Gao Gang. Zhou commanded Chai Chengwen to conduct a topographical survey of Korea, and directed Lei Yingfu, Zhou's military advisor in Korea, to analyze the military situation in Korea. Lei concluded that MacArthur would most likely attempt a landing at Incheon. After conferring with Mao that this would be MacArthur's most likely strategy, Zhou briefed Soviet and North Korean advisers of Lei's findings, and issued orders to Chinese army commanders deployed on the Korean border to prepare for American naval activity in the Korea Strait.

Where did the Chinese military deploy troops in preparation for the arrival of US troops?
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A: the Korean border


Problem: Pub:

CAMRA maintains a "National Inventory" of historical notability and of architecturally and decoratively notable pubs. The National Trust owns thirty-six public houses of historic interest including the George Inn, Southwark, London and The Crown Liquor Saloon, Belfast, Northern Ireland.

What part of the United Kingdom is Belfast located in?
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A: Northern Ireland


Problem: Carnival:

The Carnival of Vilanova i la Geltrú has documented history from 1790 and is one of the richest in the variety of its acts and rituals. It adopts an ancient style in which satire, the grotesque body (particularly cross-dressing and displays of exaggerated bellies, noses and phalli) and above all, active participation are valued over glamorous, media-friendly spectacles that Vilanovins mock as "thighs and feathers". It is best known for Les Comparses (held on Sunday), a tumultuous dance in which 12,000 or more dancers organized into rival groups throw 75 tons of hard candies at one other. The women protect their faces with Mantons de Manila (Manila shawls) but eye-patches and slings for broken arms are common the following week. Vilanovins organize an elaborate ritual for the arrival of King Carnival called l'Arrivo that changes every year. It includes a raucous procession of floats and dancers lampooning current events or public figures and a bitingly satiric sermon (el sermo) delivered by the King himself. On Dijous Gras, Vilanovin children are excused from school to participate in the Merengada, a day-long scene of eating and fighting with sticky, sweet meringue.

What's the name of the day-long agenda of eating and fighting with meringue?
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A:
Merengada