Input: Read this: Libraries and museums have been established for other presidents, but they are not part of the NARA presidential library system, and are operated by private foundations, historical societies, or state governments, including the Abraham Lincoln, Rutherford B. Hayes, William McKinley, Woodrow Wilson and Calvin Coolidge libraries. For example, the Abraham Lincoln Presidential Library and Museum is owned and operated by the state of Illinois.
Question: What group operates the Calvin Coolidge library?

Output: unanswerable


QUES: Following Die Another Day, Madonna collaborated with fashion photographer Steven Klein in 2003 for an exhibition installation named X-STaTIC Pro=CeSS. It included photography from a photo shoot in W magazine, and seven video segments. The installation ran from March to May in New York's Deitch Projects gallery. It traveled the world in an edited form. The same year, Madonna released her ninth studio album, American Life, which was based on her observations of American society; it received mixed reviews. She commented, "[American Life] was like a trip down memory lane, looking back at everything I've accomplished and all the things I once valued and all the things that were important to me." Larry Flick from The Advocate felt that "American Life is an album that is among her most adventurous and lyrically intelligent" while condemning it as "a lazy, half-arsed effort to sound and take her seriously." The title song peaked at number 37 on the Hot 100. Its original music video was canceled as Madonna thought that the video, featuring violence and war imagery, would be deemed unpatriotic since America was then at war with Iraq. With four million copies sold worldwide, American Life was the lowest-selling album of her career at that point.

How many copies did the album sell worldwide?
What is the answer?
ANS: four million


QUES: Germany has a comprehensive school known as the Gesamtschule. While some German schools such as the Gymnasium and the Realschule have rather strict entrance requirements, the Gesamtschule does not have such requirements. They offer college preparatory classes for the students who are doing well, general education classes for average students, and remedial courses for those who aren't doing that well. In most cases students attending a Gesamtschule may graduate with the Hauptschulabschluss, the Realschulabschluss or the Abitur depending on how well they did in school.
What kinds of courses are offered to students who are not experiencing academic success?

ANS: remedial


Greece's foreign policy is conducted through the Ministry for Foreign Affairs and its head, the Minister for Foreign Affairs. The current minister is Nikos Kotzias. According to the official website, the main aims of the Ministry for Foreign Affairs are to represent Greece before other states and international organizations; safeguarding the interests of the Greek state and of its citizens abroad; the promotion of Greek culture; the fostering of closer relations with the Greek diaspora; and the promotion of international cooperation. Additionally, due to its political and geographical proximity to Europe, Asia, the Middle East and Africa, Greece is a country of significant geostrategic importance and is considered to be a middle power and has developed a regional policy to help promote peace and stability in the Balkans, the Mediterranean, and the Middle East.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Greece is though of as what kind of power?
Ah, so.. a middle power


Question: The service's B-2A aircraft entered service in the 1990s, its B-1B aircraft in the 1980s and its current B-52H aircraft in the early 1960s. The B-52 Stratofortress airframe design is over 60 years old and the B-52H aircraft currently in the active inventory were all built between 1960 and 1962. The B-52H is scheduled to remain in service for another 30 years, which would keep the airframe in service for nearly 90 years, an unprecedented length of service for any aircraft. The B-21 is projected to replace the B-52 and parts of the B-1B force by the mid-2020s.
Try to answer this question if possible: When did the USAF introduce the B-1B aircraft? 
Answer: 1980s


Context and question: Other widely used alloys that contain zinc include nickel silver, typewriter metal, soft and aluminium solder, and commercial bronze. Zinc is also used in contemporary pipe organs as a substitute for the traditional lead/tin alloy in pipes. Alloys of 85–88% zinc, 4–10% copper, and 2–8% aluminium find limited use in certain types of machine bearings. Zinc is the primary metal used in making American one cent coins since 1982. The zinc core is coated with a thin layer of copper to give the impression of a copper coin. In 1994, 33,200 tonnes (36,600 short tons) of zinc were used to produce 13.6 billion pennies in the United States.
What is the only metal used in pipe organs?
Answer:
unanswerable