Problem: Circadian rhythm:

Light is the signal by which plants synchronize their internal clocks to their environment and is sensed by a wide variety of photoreceptors. Red and blue light are absorbed through several phytochromes and cryptochromes. One phytochrome, phyA, is the main phytochrome in seedlings grown in the dark but rapidly degrades in light to produce Cry1. Phytochromes B–E are more stable with phyB, the main phytochrome in seedlings grown in the light. The cryptochrome (cry) gene is also a light-sensitive component of the circadian clock and is thought to be involved both as a photoreceptor and as part of the clock's endogenous pacemaker mechanism. Cryptochromes 1–2 (involved in blue–UVA) help to maintain the period length in the clock through a whole range of light conditions.

What absorbes white light for plants?
---
A: unanswerable


Problem: The total number of Greeks living outside Greece and Cyprus today is a contentious issue. Where Census figures are available, they show around 3 million Greeks outside Greece and Cyprus. Estimates provided by the SAE - World Council of Hellenes Abroad put the figure at around 7 million worldwide. According to George Prevelakis of Sorbonne University, the number is closer to just below 5 million. Integration, intermarriage, and loss of the Greek language influence the self-identification of the Omogeneia. Important centres of the New Greek Diaspora today are London, New York, Melbourne and Toronto. In 2010, the Hellenic Parliament introduced a law that enables Diaspora Greeks in Greece to vote in the elections of the Greek state. This law was later repealed in early 2014.
Who provided the contradictory  population numbers for Greeks abroad ?
---
Answer: World Council of Hellenes Abroad


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The ISO 216 system used in most other countries is based on the surface area of a sheet of paper, not on a sheet's width and length. It was first adopted in Germany in 1922 and generally spread as nations adopted the metric system. The largest standard size paper is A0 (A zero), measuring one square meter (approx. 1189 × 841 mm). Two sheets of A1, placed upright side by side fit exactly into one sheet of A0 laid on its side. Similarly, two sheets of A2 fit into one sheet of A1 and so forth. Common sizes used in the office and the home are A4 and A3 (A3 is the size of two A4 sheets).
 What is the smallest standard size paper?
A: unanswerable


Context and question: By that time, the majority of black people in the United States were native-born, so the use of the term "African" became problematic. Though initially a source of pride, many blacks feared that the use of African as an identity would be a hindrance to their fight for full citizenship in the US. They also felt that it would give ammunition to those who were advocating repatriating black people back to Africa. In 1835, black leaders called upon Black Americans to remove the title of "African" from their institutions and replace it with "Negro" or "Colored American". A few institutions chose to keep their historic names, such as the African Methodist Episcopal Church. African Americans popularly used the terms "Negro" or "colored" for themselves until the late 1960s.
What year did Black leaders call for this change in language?
Answer: 1835,


Question: Managers in the Premier League are involved in the day-to-day running of the team, including the training, team selection, and player acquisition. Their influence varies from club-to-club and is related to the ownership of the club and the relationship of the manager with fans. Managers are required to have a UEFA Pro Licence which is the final coaching qualification available, and follows the completion of the UEFA 'B' and 'A' Licences. The UEFA Pro Licence is required by every person who wishes to manage a club in the Premier League on a permanent basis (i.e. more than 12 weeks – the amount of time an unqualified caretaker manager is allowed to take control). Caretaker appointments are managers that fill the gap between a managerial departure and a new appointment. Several caretaker managers have gone on to secure a permanent managerial post after performing well as a caretaker; examples include Paul Hart at Portsmouth and David Pleat at Tottenham Hotspur.
Is there an answer to this question: What is a caretaker manager?

Answer: Caretaker appointments are managers that fill the gap between a managerial departure and a new appointment.


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In 1636 George, Duke of Brunswick-Lüneburg, ruler of the Brunswick-Lüneburg principality of Calenberg, moved his residence to Hanover. The Dukes of Brunswick-Lüneburg were elevated by the Holy Roman Emperor to the rank of Prince-Elector in 1692, and this elevation was confirmed by the Imperial Diet in 1708. Thus the principality was upgraded to the Electorate of Brunswick-Lüneburg, colloquially known as the Electorate of Hanover after Calenberg's capital (see also: House of Hanover). Its electors would later become monarchs of Great Britain (and from 1801, of the United Kingdom of Great Britain and Ireland). The first of these was George I Louis, who acceded to the British throne in 1714. The last British monarch who ruled in Hanover was William IV. Semi-Salic law, which required succession by the male line if possible, forbade the accession of Queen Victoria in Hanover. As a male-line descendant of George I, Queen Victoria was herself a member of the House of Hanover. Her descendants, however, bore her husband's titular name of Saxe-Coburg-Gotha. Three kings of Great Britain, or the United Kingdom, were concurrently also Electoral Princes of Hanover.
What other title did three queens of Great Britain with United kingdom also hold?
A:
unanswerable