Problem: Light-emitting diode:

The light from LEDs can be modulated very quickly so they are used extensively in optical fiber and free space optics communications. This includes remote controls, such as for TVs, VCRs, and LED Computers, where infrared LEDs are often used. Opto-isolators use an LED combined with a photodiode or phototransistor to provide a signal path with electrical isolation between two circuits. This is especially useful in medical equipment where the signals from a low-voltage sensor circuit (usually battery-powered) in contact with a living organism must be electrically isolated from any possible electrical failure in a recording or monitoring device operating at potentially dangerous voltages. An optoisolator also allows information to be transferred between circuits not sharing a common ground potential.

What does an optoisolator do?
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A: allows information to be transferred between circuits not sharing a common ground potential

Problem: The Second Aliyah (190414), began after the Kishinev pogrom; some 40,000 Jews settled in Palestine, although nearly half of them left eventually. Both the first and second waves of migrants were mainly Orthodox Jews, although the Second Aliyah included socialist groups who established the kibbutz movement. During World War I, British Foreign Secretary Arthur Balfour sent the Balfour Declaration of 1917 to Baron Rothschild (Walter Rothschild, 2nd Baron Rothschild), a leader of the British Jewish community, that stated that Britain intended for the creation of a Jewish "national home" within the Palestinian Mandate.
How many Jews settled into Palestine?
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Answer: 40,000

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Worldwide use of solar power and wind power continued to grow significantly in 2012. Solar electricity consumption increased by 58 percent, to 93 terawatt-hours (TWh). Use of wind power in 2012 increased by 18.1 percent, to 521.3 TWh. Global solar and wind energy installed capacities continued to expand even though new investments in these technologies declined during 2012. Worldwide investment in solar power in 2012 was $140.4 billion, an 11 percent decline from 2011, and wind power investment was down 10.1 percent, to $80.3 billion. But due to lower production costs for both technologies, total installed capacities grew sharply. This investment decline, but growth in installed capacity, may again occur in 2013. Analysts expect the market to triple by 2030. In 2015, investment in renewables exceeded fossils.
In 2013, solar electricity consumption increased by what percentage?
A: unanswerable

Context and question: In the mid-1990s, Dell expanded beyond desktop computers and laptops by selling servers, starting with low-end servers. The major three providers of servers at the time were IBM, Hewlett Packard, and Compaq, many of which were based on proprietary technology, such as IBM's Power4 microprocessors or various proprietary versions of the Unix operating system. Dell's new PowerEdge servers did not require a major investment in proprietary technologies, as they ran Microsoft Windows NT on Intel chips, and could be built cheaper than its competitors. Consequently, Dell's enterprise revenues, almost nonexistent in 1994, accounted for 13 percent of the company's total intake by 1998. Three years later, Dell passed Compaq as the top provider of Intel-based servers, with 31 percent of the market. Dell's first acquisition occurred in 1999 with the purchase of ConvergeNet Technologies for $332 million, after Dell had failed to develop an enterprise storage system in-house; ConvergeNet's elegant but complex technology did not fit in with Dell's commodity-producer business model, forcing Dell to write down the entire value of the acquisition.
IBM, Hewlett Packard, and Compaq were the major providers of what?
Answer: servers

Question: Mass production of glass window panes in the early twentieth century caused a similar effect. In glass factories, molten glass was poured onto a large cooling table and allowed to spread. The resulting glass is thicker at the location of the pour, located at the center of the large sheet. These sheets were cut into smaller window panes with nonuniform thickness, typically with the location of the pour centered in one of the panes (known as "bull's-eyes") for decorative effect. Modern glass intended for windows is produced as float glass and is very uniform in thickness.
Is there an answer to this question: Currently large sheets are made as what?

Answer: unanswerable

QUES: The company continued to carefully review submitted titles, giving them scores using a 40-point scale and allocating Nintendo's marketing resources accordingly. Each region performed separate evaluations. Nintendo of America also maintained a policy that, among other things, limited the amount of violence in the games on its systems. One game, Mortal Kombat, would challenge this policy. A surprise hit in arcades in 1992, Mortal Kombat features splashes of blood and finishing moves that often depict one character dismembering the other. Because the Genesis version retained the gore while the SNES version did not, it outsold the SNES version by a ratio of three or four-to-one.

What was the policy of Genesis about games?
What is the answer?
ANS:
unanswerable