Input: Read this: Hops contain several characteristics that brewers desire in beer. Hops contribute a bitterness that balances the sweetness of the malt; the bitterness of beers is measured on the International Bitterness Units scale. Hops contribute floral, citrus, and herbal aromas and flavours to beer. Hops have an antibiotic effect that favours the activity of brewer's yeast over less desirable microorganisms and aids in "head retention", the length of time that a foamy head created by carbonation will last. The acidity of hops is a preservative.
Question: What do you call the length of time that foam is on top of beer because of carbonation?

Output: head retention


QUES: There have been six instances as of 2009 in which the exemption process was initiated. Of these six, one was granted, one was partially granted, one was denied and three were withdrawn. Donald Baur, in The Endangered Species Act: law, policy, and perspectives, concluded," ... the exemption provision is basically a nonfactor in the administration of the ESA. A major reason, of course, is that so few consultations result in jeopardy opinions, and those that do almost always result in the identification of reasonable and prudent alternatives to avoid jeopardy."

What did Donald Baur write in 2009?
What is the answer?
ANS: unanswerable


QUES: In addition to the above, Greece is also to start oil and gas exploration in other locations in the Ionian Sea, as well as the Libyan Sea, within the Greek exclusive economic zone, south of Crete. The Ministry of the Environment, Energy and Climate Change announced that there was interest from various countries (including Norway and the United States) in exploration, and the first results regarding the amount of oil and gas in these locations were expected in the summer of 2012. In November 2012, a report published by Deutsche Bank estimated the value of natural gas reserves south of Crete at €427 billion.
What did the Deutsche Bank estimate the value of the reserves to become in years ahead?

ANS: unanswerable


In 1961, Nasser sought to firmly establish Egypt as the leader of the Arab world and to promote a second revolution in Egypt with the purpose of merging Islamic and socialist thinking. To achieve this, he initiated several reforms to modernize al-Azhar, which serves as the de facto leading authority in Sunni Islam, and to ensure its prominence over the Muslim Brotherhood and the more conservative Wahhabism promoted by Saudi Arabia. Nasser had used al-Azhar's most willing ulema (scholars) as a counterweight to the Brotherhood's Islamic influence, starting in 1953.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What country did Nasser want to be the leader of the Arab world?
Ah, so.. Egypt


Question: Catalan dialects are relatively uniform, and are mutually intelligible. They are divided into two blocks, Eastern and Western, differing mostly in pronunciation. The terms "Catalan" and "Valencian" (respectively used in Catalonia and the Valencian Community) are two different varieties of the same language. There are two institutions regulating the two standard varieties, the Institute of Catalan Studies in Catalonia and the Valencian Academy of the Language in Valencia.
Try to answer this question if possible: What are Catalan and Valencian considered to be in the language?
Answer: two standard varieties


Problem: Although spoken Tibetan varies according to the region, the written language, based on Classical Tibetan, is consistent throughout. This is probably due to the long-standing influence of the Tibetan empire, whose rule embraced (and extended at times far beyond) the present Tibetan linguistic area, which runs from northern Pakistan in the west to Yunnan and Sichuan in the east, and from north of Qinghai Lake south as far as Bhutan. The Tibetan language has its own script which it shares with Ladakhi and Dzongkha, and which is derived from the ancient Indian Brāhmī script.
What is the ancient Indian Brahmi script derived from?
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Answer:
unanswerable