Problem: Light-emitting diode:

Phosphor-based LED efficiency losses are due to the heat loss from the Stokes shift and also other phosphor-related degradation issues. Their luminous efficacies compared to normal LEDs depend on the spectral distribution of the resultant light output and the original wavelength of the LED itself. For example, the luminous efficacy of a typical YAG yellow phosphor based white LED ranges from 3 to 5 times the luminous efficacy of the original blue LED because of the human eye's greater sensitivity to yellow than to blue (as modeled in the luminosity function). Due to the simplicity of manufacturing the phosphor method is still the most popular method for making high-intensity white LEDs. The design and production of a light source or light fixture using a monochrome emitter with phosphor conversion is simpler and cheaper than a complex RGB system, and the majority of high-intensity white LEDs presently on the market are manufactured using phosphor light conversion.

Why is efficiency never lost in phosphor-based LEDs?
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A: unanswerable

Problem: The site of Richmond had been an important village of the Powhatan Confederacy, and was briefly settled by English colonists from Jamestown in 1609, and in 16101611. The present city of Richmond was founded in 1737. It became the capital of the Colony and Dominion of Virginia in 1780. During the Revolutionary War period, several notable events occurred in the city, including Patrick Henry's "Give me liberty or give me death" speech in 1775 at St. John's Church, and the passage of the Virginia Statute for Religious Freedom written by Thomas Jefferson. During the American Civil War, Richmond served as the capital of the Confederate States of America. The city entered the 20th century with one of the world's first successful electric streetcar systems, as well as a national hub of African-American commerce and culture, the Jackson Ward neighborhood.
In what year was the current city of Richmond founded?
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Answer: 1737

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
From an institutional perspective, the rules of the House assign a number of specific responsibilities to the minority leader. For example, Rule XII, clause 6, grant the minority leader (or his designee) the right to offer a motion to recommit with instructions; Rule II, clause 6, states the Inspector General shall be appointed by joint recommendation of the Speaker, majority leader, and minority leader; and Rule XV, clause 6, provides that the Speaker, after consultation with the minority leader, may place legislation on the Corrections Calendar. The minority leader also has other institutional duties, such as appointing individuals to certain federal entities.
Who are able to appoint individuals to the House according to Rule II, clause 6?
A: unanswerable

Context and question: On April 29, 2011, the boundaries for the state-run tourism district were set. The district would include heavier police presence, as well as beautification and infrastructure improvements. The CRDA would oversee all functions of the district and will make changes to attract new businesses and attractions. New construction would be ambitious and may resort to eminent domain.
What two qualities were mentioned in regards to new construction?
Answer: would be ambitious and may resort to eminent domain

Question: Darwin's barnacle studies convinced him that variation arose constantly and not just in response to changed circumstances. In 1854, he completed the last part of his Beagle-related writing and began working full-time on evolution. His thinking changed from the view that species formed in isolated populations only, as on islands, to an emphasis on speciation without isolation; that is, he saw increasing specialisation within large stable populations as continuously exploiting new ecological niches. He conducted empirical research focusing on difficulties with his theory. He studied the developmental and anatomical differences between different breeds of many domestic animals, became actively involved in fancy pigeon breeding, and experimented (with the help of his son Francis) on ways that plant seeds and animals might disperse across oceans to colonise distant islands. By 1856, his theory was much more sophisticated, with a mass of supporting evidence.
Is there an answer to this question: By which year had Darwin's theory become more complex and supported by a lot of evidence?

Answer: 1856

Problem: Dissolution of the Soviet Union:

The Baltic Way or Baltic Chain (also Chain of Freedom Estonian: Balti kett, Latvian: Baltijas cels, Lithuanian: Baltijos kelias, Russian: ) was a peaceful political demonstration on August 23, 1989. An estimated 2 million people joined hands to form a human chain extending 600 kilometres (370 mi) across Estonia, Latvia and Lithuania, which had been forcibly reincorporated into the Soviet Union in 1944. The colossal demonstration marked the 50th anniversary of the MolotovRibbentrop Pact that divided Eastern Europe into spheres of influence and led to the occupation of the Baltic states in 1940.

What states did the chain extend over?
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A:
Estonia, Latvia and Lithuania