Problem: Glass:

Glass has the ability to refract, reflect, and transmit light following geometrical optics, without scattering it. It is used in the manufacture of lenses and windows. Common glass has a refraction index around 1.5. This may be modified by adding low-density materials such as boron, which lowers the index of refraction (see crown glass), or increased (to as much as 1.8) with high-density materials such as (classically) lead oxide (see flint glass and lead glass), or in modern uses, less toxic oxides of zirconium, titanium, or barium. These high-index glasses (inaccurately known as "crystal" when used in glass vessels) cause more chromatic dispersion of light, and are prized for their diamond-like optical properties.

What can be used to make glass less refractive?
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A: boron

Problem: The book aroused international interest and a widespread debate, with no sharp line between scientific issues and ideological, social and religious implications. Much of the initial reaction was hostile, but Darwin had to be taken seriously as a prominent and respected name in science. There was much less controversy than had greeted the 1844 publication Vestiges of Creation, which had been rejected by scientists, but had influenced a wide public readership into believing that nature and human society were governed by natural laws. The Origin of Species as a book of wide general interest became associated with ideas of social reform. Its proponents made full use of a surge in the publication of review journals, and it was given more popular attention than almost any other scientific work, though it failed to match the continuing sales of Vestiges. Darwin's book legitimised scientific discussion of evolutionary mechanisms, and the newly coined term Darwinism was used to cover the whole range of evolutionism, not just his own ideas. By the mid-1870s, evolutionism was triumphant.
What field of ideas latched onto On the Origin of Species when it became a widespread success?
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Answer: social reform

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
More recent Lancashire-born composers include Hugh Wood (1932- Parbold), Sir Peter Maxwell Davies (1934-, Salford), Sir Harrison Birtwistle (1934-, Accrington), Gordon Crosse (1937-, Bury),John McCabe (1939-2015, Huyton), Roger Smalley (1943-2015, Swinton), Nigel Osborne (1948-, Manchester), Steve Martland (1954-2013, Liverpool), Simon Holt (1958-, Bolton) and Philip Cashian (1963-, Manchester). The Royal Manchester College of Music was founded in 1893 to provide a northern counterpart to the London musical colleges. It merged with the Northern College of Music (formed in 1920) to form the Royal Northern College of Music in 1972.
When was the Royal Northern College of Music formed?
A: 1972

Context and question: All states have a geographic scope of interests, actions, or projected power. This is a crucial factor in distinguishing a great power from a regional power; by definition the scope of a regional power is restricted to its region. It has been suggested that a great power should be possessed of actual influence throughout the scope of the prevailing international system. Arnold J. Toynbee, for example, observes that "Great power may be defined as a political force exerting an effect co-extensive with the widest range of the society in which it operates. The Great powers of 1914 were 'world-powers' because Western society had recently become 'world-wide'."
What political force was world-wide in 1914?
Answer: unanswerable

Question: Many Muslims criticized the Umayyads for having too many non-Muslim, former Roman administrators in their government. St John of Damascus was also a high administrator in the Umayyad administration. As the Muslims took over cities, they left the peoples political representatives and the Roman tax collectors and the administrators. The taxes to the central government were calculated and negotiated by the peoples political representatives. The Central government got paid for the services it provided and the local government got the money for the services it provided. Many Christian cities also used some of the taxes on maintain their churches and run their own organizations. Later the Umayyads were criticized by some Muslims for not reducing the taxes of the people who converted to Islam. These new converts continues to pay the same taxes that were previously negotiated.
Is there an answer to this question: What was the Central government not paid for?

Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Born in 1926, Harper Lee grew up in the Southern town of Monroeville, Alabama, where she became close friends with soon-to-be famous writer Truman Capote. She attended Huntingdon College in Montgomery (194445), and then studied law at the University of Alabama (194549). While attending college, she wrote for campus literary magazines: Huntress at Huntingdon and the humor magazine Rammer Jammer at the University of Alabama. At both colleges, she wrote short stories and other works about racial injustice, a rarely mentioned topic on such campuses at the time. In 1950, Lee moved to New York City, where she worked as a reservation clerk for British Overseas Airways Corporation; there, she began writing a collection of essays and short stories about people in Monroeville. Hoping to be published, Lee presented her writing in 1957 to a literary agent recommended by Capote. An editor at J. B. Lippincott , who bought the manuscript, advised her to quit the airline and concentrate on writing. Donations from friends allowed her to write uninterrupted for a year.
Who did Harper Lee become childhood friends with?
A:
Truman Capote