Problem: Glass:

New chemical glass compositions or new treatment techniques can be initially investigated in small-scale laboratory experiments. The raw materials for laboratory-scale glass melts are often different from those used in mass production because the cost factor has a low priority. In the laboratory mostly pure chemicals are used. Care must be taken that the raw materials have not reacted with moisture or other chemicals in the environment (such as alkali or alkaline earth metal oxides and hydroxides, or boron oxide), or that the impurities are quantified (loss on ignition). Evaporation losses during glass melting should be considered during the selection of the raw materials, e.g., sodium selenite may be preferred over easily evaporating SeO2. Also, more readily reacting raw materials may be preferred over relatively inert ones, such as Al(OH)3 over Al2O3. Usually, the melts are carried out in platinum crucibles to reduce contamination from the crucible material. Glass homogeneity is achieved by homogenizing the raw materials mixture (glass batch), by stirring the melt, and by crushing and re-melting the first melt. The obtained glass is usually annealed to prevent breakage during processing.

What containers are used for melting?
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A: platinum crucibles

Problem: On April 19, the BBC reported that 1,300 people had gathered outside BBC buildings in Manchester and London, protesting against what they described as Western media bias. Several days earlier, the BBC had published an article entitled "The challenges of reporting in China", responding to earlier criticism. The BBC's Paul Danahar noted that Chinese people were now "able to access the BBC News website for the first time, after years of strict censorship", and that "many were critical of our coverage". He provided readers with a reminder of censorship in China, and added: "People who criticise the media for their coverage in Tibet should acknowledge that we were and still are banned from reporting there." He also quoted critical Chinese responses, and invited readers to comment.
How many people gathered in protest at these two buildings?
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Answer: 1,300

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In the 2010s, American jurisdictions have experienced a shortage of lethal injection drugs, due to anti-death penalty advocacy and low production volume. Hospira, the only U.S. manufacturer of sodium thiopental, stopped making the drug in 2011. The European Union has outlawed the export of any product that could be used in an execution; this has prevented executioners from using EU-manufactured anesthetics like propofol which are needed for general medical purposes. Another alternative, pentobarbital, is also only manufactured in the European Union, which has caused the Danish producer to restrict distribution to U.S. government customers.
The EU outlawed the export of products that could never be used in what activity?
A: unanswerable

Context and question: Another advantage, at least to some consumers, was the lack of any sort of anti-piracy technology. It was claimed that Macrovision's Copyguard protection could not be applied to LaserDisc, due to the format's design. The vertical blanking interval, where the Macrovision signal would be implemented, was also used for the internal timing on LaserDisc players, so test discs with Macrovision would not play at all. There was never a push to redesign the format despite the obvious potential for piracy due to its relatively small market share. The industry simply decided to engineer it into the DVD specification.
What protection could not be applied to LaserDiscs, making them prone to piracy?
Answer: Macrovision's Copyguard protection

Question: Oklahoma City has several public career and technology education schools associated with the Oklahoma Department of Career and Technology Education, the largest of which are Metro Technology Center and Francis Tuttle Technology Center.
Is there an answer to this question: What are the two largest technology education schools in Oklahoma City?

Answer: Metro Technology Center and Francis Tuttle Technology Center

Problem: Spanish language in the United States:

As civil wars engulfed several Central American countries in the 1980s, hundreds of thousands of Salvadorans fled their country and came to the United States. Between 1980 and 1990, the Salvadoran immigrant population in the United States increased nearly fivefold from 94,000 to 465,000. The number of Salvadoran immigrants in the United States continued to grow in the 1990s and 2000s as a result of family reunification and new arrivals fleeing a series of natural disasters that hit El Salvador, including earthquakes and hurricanes. By 2008, there were about 1.1 million Salvadoran immigrants in the United States.

What was the population of El Salvador in 1990?
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A:
unanswerable