Problem: Red was the color of the banner of the Byzantine emperors. In Western Europe, Emperor Charlemagne painted his palace red as a very visible symbol of his authority, and wore red shoes at his coronation. Kings, princes and, beginning in 1295, Roman Catholic cardinals began to wear red costumes. When Abbe Suger rebuilt Saint Denis Basilica outside Paris in the early 12th century, he added stained glass windows colored blue cobalt glass and red glass tinted with copper. Together they flooded the basilica with a mystical light. Soon stained glass windows were being added to cathedrals all across France, England and Germany. In Medieval painting red was used to attract attention to the most important figures; both Christ and the Virgin Mary were commonly painted wearing red mantles.
What began in 1259?
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Answer: unanswerable

Problem: Energy sources unsuitable for mobile power plants, such as nuclear power, renewable hydroelectricity, or wind power can be used. According to widely accepted global energy reserve statistics, the reserves of liquid fuel are much less than gas and coal (at 42, 167 and 416 years respectively). Most countries with large rail networks do not have significant oil reserves and those that did, like the United States and Britain, have exhausted much of their reserves and have suffered declining oil output for decades. Therefore, there is also a strong economic incentive to substitute other fuels for oil. Rail electrification is often considered an important route towards consumption pattern reform. However, there are no reliable, peer-reviewed studies available to assist in rational public debate on this critical issue, although there are untranslated Soviet studies from the 1980s.
Energy sources suitable for mobile power plants include what?
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Answer: unanswerable

Problem: The Dutch language has been known under a variety of names. In Middle Dutch, which was a collection of dialects, dietsc was used in Flanders and Brabant, while diets or duutsc was in use in the Northern Netherlands. It derived from the Old Germanic word theudisk, one of the first names ever used for the non-Romance languages of Western Europe, meaning (pertaining to the language) of the people, that is, the native Germanic language. The term was used as opposed to Latin, the non-native language of writing and the Catholic Church. In the first text in which it is found, dating from 784, it refers to the Germanic dialects of Britain. In the Oaths of Strasbourg (842) it appeared as teudisca to refer to the Germanic (Rhenish Franconian) portion of the oath.
What year were the Oaths of Strasbourg written?
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Answer:
842