Problem: MP3:

MPEG-1 or MPEG-2 Audio Layer III, more commonly referred to as MP3, is an audio coding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio streaming or storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on most digital audio players.

Where will MP3 files most commonly be found?
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A: digital audio players


Problem: Birds occupy a wide range of ecological positions. While some birds are generalists, others are highly specialised in their habitat or food requirements. Even within a single habitat, such as a forest, the niches occupied by different species of birds vary, with some species feeding in the forest canopy, others beneath the canopy, and still others on the forest floor. Forest birds may be insectivores, frugivores, and nectarivores. Aquatic birds generally feed by fishing, plant eating, and piracy or kleptoparasitism. Birds of prey specialise in hunting mammals or other birds, while vultures are specialised scavengers. Avivores are animals that are specialized at preying on birds.
What type of birds may be either insectivores, frugivores and nectarivores?
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Answer: Forest birds


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Widowed in 1861, the grief-stricken Queen withdrew from public life and left Buckingham Palace to live at Windsor Castle, Balmoral Castle and Osborne House. For many years the palace was seldom used, even neglected. In 1864, a note was found pinned to the fence of Buckingham Palace, saying: "These commanding premises to be let or sold, in consequence of the late occupant's declining business." Eventually, public opinion forced the Queen to return to London, though even then she preferred to live elsewhere whenever possible. Court functions were still held at Windsor Castle, presided over by the sombre Queen habitually dressed in mourning black, while Buckingham Palace remained shuttered for most of the year.
Where were court functions held upon the Queens exile from London?
A: unanswerable


Context and question: Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight and enable solar energy to be harnessed at different levels around the world, mostly depending on distance from the equator. Although solar energy refers primarily to the use of solar radiation for practical ends, all renewable energies, other than geothermal and tidal, derive their energy from the Sun in a direct or indirect way.
Which renewable energies do not acquire their energy from the sun?
Answer: geothermal and tidal


Question: Korean Presbyterian denominations are active in evangelism and many of its missionaries are being sent overseas, being the second biggest missionary sender in the world after the United States. GSM, the missionary body of the "Hapdong" General Assembly of Presbyterian Churches of Korea, is the single largest Presbyterian missionary organization in Korea. In addition there are many Korean-American Presbyterians in the United States, either with their own church sites or sharing space in pre-existing churches as is the case in Australia, New Zealand and even Muslim countries such as Saudi Arabia with Korean immigration.
Is there an answer to this question: Where are many United States-American Presbyterians located?

Answer: unanswerable


Problem: Guinea-Bissau:

14% of the population speaks the official language Portuguese, the language of government and national communication during centuries of colonial rule. 44% speak Kriol, a Portuguese-based creole language, which is effectively a national language of communication among groups. The remainder speak a variety of native African languages unique to ethnicities.

What is the official language of Guinea-Bissau?
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A:
Portuguese