Problem: Beer:

After boiling, the hopped wort is now cooled, ready for the yeast. In some breweries, the hopped wort may pass through a hopback, which is a small vat filled with hops, to add aromatic hop flavouring and to act as a filter; but usually the hopped wort is simply cooled for the fermenter, where the yeast is added. During fermentation, the wort becomes beer in a process which requires a week to months depending on the type of yeast and strength of the beer. In addition to producing ethanol, fine particulate matter suspended in the wort settles during fermentation. Once fermentation is complete, the yeast also settles, leaving the beer clear.

What substance is added to hopped wort once it cools after boiling?
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A: yeast

Problem: Uprisings and demands by African leaders led the UN to assume direct responsibility over the territory. It recognised the South West Africa People's Organisation (SWAPO) as the official representative of the Namibian people in 1973. Namibia, however, remained under South African administration during this time as South-West Africa. Following internal violence, South Africa installed an interim administration in Namibia in 1985. Namibia obtained full independence from South Africa in 1990, with the exception of Walvis Bay and the Penguin Islands, which remained under South African control until 1994.
In what region of Namibia is Walvis Bay?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Popper played a vital role in establishing the philosophy of science as a vigorous, autonomous discipline within philosophy, through his own prolific and influential works, and also through his influence on his own contemporaries and students. Popper founded in 1946 the Department of Philosophy, Logic and Scientific Method at the London School of Economics and there lectured and influenced both Imre Lakatos and Paul Feyerabend, two of the foremost philosophers of science in the next generation of philosophy of science. (Lakatos significantly modified Popper's position,:1 and Feyerabend repudiated it entirely, but the work of both is deeply influenced by Popper and engaged with many of the problems that Popper set.)
What department did Einstein found in 1946 in London?
A: unanswerable

Context and question: In response to attribution of recent climate change, the City of Melbourne, in 2002, set a target to reduce carbon emissions to net zero by 2020 and Moreland City Council established the Zero Moreland program, however not all metropolitan municipalities have followed, with the City of Glen Eira notably deciding in 2009 not to become carbon neutral. Melbourne has one of the largest urban footprints in the world due to its low density housing, resulting in a vast suburban sprawl, with a high level of car dependence and minimal public transport outside of inner areas. Much of the vegetation within the city are non-native species, most of European origin, and in many cases plays host to invasive species and noxious weeds. Significant introduced urban pests include the common myna, feral pigeon, brown rat, European wasp, common starling and red fox. Many outlying suburbs, particularly towards the Yarra Valley and the hills to the north-east and east, have gone for extended periods without regenerative fires leading to a lack of saplings and undergrowth in urbanised native bushland. The Department of Sustainability and Environment partially addresses this problem by regularly burning off. Several national parks have been designated around the urban area of Melbourne, including the Mornington Peninsula National Park, Port Phillip Heads Marine National Park and Point Nepean National Park in the south east, Organ Pipes National Park to the north and Dandenong Ranges National Park to the east. There are also a number of significant state parks just outside Melbourne. Responsibility for regulating pollution falls under the jurisdiction of the EPA Victoria and several local councils. Air pollution, by world standards, is classified as being good. Summer and autumn are the worst times of year for atmospheric haze in the urban area.
Who is responsible for regulating pollution in Melbourne?
Answer: EPA Victoria and several local councils

Question: Coordination strategies differ when adjacent time zones shift clocks. The European Union shifts all at once, at 01:00 UTC or 02:00 CET or 03:00 EET; for example, Eastern European Time is always one hour ahead of Central European Time. Most of North America shifts at 02:00 local time, so its zones do not shift at the same time; for example, Mountain Time is temporarily (for one hour) zero hours ahead of Pacific Time, instead of one hour ahead, in the autumn and two hours, instead of one, ahead of Pacific Time in the spring. In the past, Australian districts went even further and did not always agree on start and end dates; for example, in 2008 most DST-observing areas shifted clocks forward on October 5 but Western Australia shifted on October 26. In some cases only part of a country shifts; for example, in the US, Hawaii and most of Arizona do not observe DST.
Is there an answer to this question: In 2008, what month and day did Western Australia change their clocks?

Answer: October 26

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Incandescent bulbs are much less efficient than most other types of electric lighting; incandescent bulbs convert less than 5% of the energy they use into visible light, with standard light bulbs averaging about 2.2%. The remaining energy is converted into heat. The luminous efficacy of a typical incandescent bulb is 16 lumens per watt, compared with 60 lm/W for a compact fluorescent bulb or 150 lm/W for some white LED lamps. Some applications of the incandescent bulb deliberately use the heat generated by the filament. Such applications include incubators, brooding boxes for poultry, heat lights for reptile tanks, infrared heating for industrial heating and drying processes, lava lamps, and the Easy-Bake Oven toy. Incandescent bulbs typically have short lifetimes compared with other types of lighting; around 1,000 hours for home light bulbs versus typically 10,000 hours for compact fluorescents and 30,000 hours for lighting LEDs.
How long does a typical incandescent light bulb last?
A:
1,000 hours