Problem: Uranium:

Uranium was also used in photographic chemicals (especially uranium nitrate as a toner), in lamp filaments for stage lighting bulbs, to improve the appearance of dentures, and in the leather and wood industries for stains and dyes. Uranium salts are mordants of silk or wool. Uranyl acetate and uranyl formate are used as electron-dense "stains" in transmission electron microscopy, to increase the contrast of biological specimens in ultrathin sections and in negative staining of viruses, isolated cell organelles and macromolecules.

In addition to wool, what isn't uranium salt a mordant of?
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A: unanswerable

Problem: Despite being eliminated earlier in the season, Chris Daughtry (as lead of the band Daughtry) became the most successful recording artist from this season. Other contestants, such as Hicks, McPhee, Bucky Covington, Mandisa, Kellie Pickler, and Elliott Yamin have had varying levels of success.
Who was the most successful artist from this season?
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Answer: Chris Daughtry

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Predators may be put to use in conservation efforts to control introduced species. Although the aim in this situation is to remove the introduced species entirely, keeping its abundance down is often the only possibility. Predators from its natural range may be introduced to control populations, though in some cases this has little effect, and may even cause unforeseen problems. Besides their use in conservation biology, predators are also important for controlling pests in agriculture. Natural predators are an environmentally friendly and sustainable way of reducing damage to crops, and are one alternative to the use of chemical agents such as pesticides.
Predators are used in conservation to reduce what type of species from the environment?
A: introduced species

Context and question: The contemporary Liberal Party generally advocates economic liberalism (see New Right). Historically, the party has supported a higher degree of economic protectionism and interventionism than it has in recent decades. However, from its foundation the party has identified itself as anti-socialist. Strong opposition to socialism and communism in Australia and abroad was one of its founding principles. The party's founder and longest-serving leader Robert Menzies envisaged that Australia's middle class would form its main constituency.
Who founded Australia's liberal party?
Answer: Robert Menzies

Question: The Slavs under name of the Antes and the Sclaveni make their first appearance in Byzantine records in the early 6th century. Byzantine historiographers under Justinian I (527565), such as Procopius of Caesarea, Jordanes and Theophylact Simocatta describe tribes of these names emerging from the area of the Carpathian Mountains, the lower Danube and the Black Sea, invading the Danubian provinces of the Eastern Empire.
Is there an answer to this question: What was another name for Byzantine?

Answer: unanswerable

Question: The release of Apple's iPad tablet computer had a negative impact on Dell and other major PC vendors, as consumers switched away from desktop and laptop PCs. Dell's own mobility division has not managed success with developing smartphones or tablets, whether running Windows or Google Android. The Dell Streak was a failure commercially and critically due to its outdated OS, numerous bugs, and low resolution screen. InfoWorld suggested that Dell and other OEMs saw tablets as a short-term, low-investment opportunity running Google Android, an approach that neglected user interface and failed to gain long term market traction with consumers. Dell has responded by pushing higher-end PCs, such as the XPS line of notebooks, which do not compete with the Apple iPad and Kindle Fire tablets. The growing popularity of smartphones and tablet computers instead of PCs drove Dell's consumer segment to an operating loss in Q3 2012. In December 2012, Dell suffered its first decline in holiday sales in five years, despite the introduction of Windows 8.
Is there an answer to this question: What year did Dell see its first rise in holiday sales?

Answer:
unanswerable