Article: 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?
Ans: head retention

Article: Regarding the classical music, it was through the Ionian islands (which were under western rule and influence) that all the major advances of the western European classical music were introduced to mainland Greeks. The region is notable for the birth of the first School of modern Greek classical music (Heptanesean or Ionian School, Greek: ), established in 1815. Prominent representatives of this genre include Nikolaos Mantzaros, Spyridon Xyndas, Spyridon Samaras and Pavlos Carrer. Manolis Kalomiris is considered the founder of the Greek National School of Music.

Question: Who is considered the Greek National School of Music founder?
Ans: Manolis Kalomiris

Article: From 1792, when the Mint Act was passed, the dollar was defined as 371.25 grains (24.056 g) of silver. Many historians[who?] erroneously assume gold was standardized at a fixed rate in parity with silver; however, there is no evidence of Congress making this law. This has to do with Alexander Hamilton's suggestion to Congress of a fixed 15:1 ratio of silver to gold, respectively. The gold coins that were minted however, were not given any denomination whatsoever and traded for a market value relative to the Congressional standard of the silver dollar. 1834 saw a shift in the gold standard to 23.2 grains (1.50 g), followed by a slight adjustment to 23.22 grains (1.505 g) in 1837 (16:1 ratio).[citation needed]

Question: What market value were gold coins traded in relation to?
Ans: Congressional standard of the silver dollar

Article: In monotheism and henotheism, God is conceived of as the Supreme Being and principal object of faith. The concept of God as described by theologians commonly includes the attributes of omniscience (infinite knowledge), omnipotence (unlimited power), omnipresence (present everywhere), omnibenevolence (perfect goodness), divine simplicity, and eternal and necessary existence. God is also usually defined as a non-corporeal being without any human biological gender, but the concept of God actively (as opposed to receptively) creating the universe has caused some religions to give "Him" the metaphorical name of "Father". Because God is conceived as not being a corporeal being, God cannot(some say should not) be portrayed in a literal visual image; some religious groups use a man (sometimes old and bearded) to symbolize God because of His deed of creating man's mind in the image of His own.

Question: What is a God in monotheism?
Ans:
Supreme Being and principal object of faith