Problem: Lighting:

LED lamps have been advocated as the newest and best environmental lighting method. According to the Energy Saving Trust, LED lamps use only 10% power compared to a standard incandescent bulb, where compact fluorescent lamps use 20% and energy saving halogen lamps 70%. The lifetime is also much longer — up to 50,000 hours. A downside is still the initial cost, which is higher than that of compact fluorescent lamps.

How much power does a halogen lamp save compared to a standard blub?
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A: 70%


Problem: Melbourne is experiencing high population growth, generating high demand for housing. This housing boom has increased house prices and rents, as well as the availability of all types of housing. Subdivision regularly occurs in the outer areas of Melbourne, with numerous developers offering house and land packages. However, after 10 years[when?] of planning policies to encourage medium-density and high-density development in existing areas with greater access to public transport and other services, Melbourne's middle and outer-ring suburbs have seen significant brownfields redevelopment.
Which of Melbourne's suburbs have seen significant brownfields redevelopment in recent years?
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Answer: middle and outer-ring


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A resin used for making non-wrinkle shirts releases formaldehyde, which could cause contact dermatitis for some people; no disclosure requirements exist, and in 2008 the U.S. Government Accountability Office tested formaldehyde in clothing and found that generally the highest levels were in non-wrinkle shirts and pants. In 1999, a study of the effect of washing on the formaldehyde levels found that after 6 months after washing, 7 of 27 shirts had levels in excess of 75 ppm, which is a safe limit for direct skin exposure.
What does not cause contact dermatitis?
A: unanswerable


Context and question: Canadian defence policy today is based on the Canada First Defence Strategy, introduced in 2008. Based on that strategy, the Canadian military is oriented and being equipped to carry out six core missions within Canada, in North America and globally. Specifically, the Canadian Armed Forces are tasked with having the capacity to:
How many missions are carried out internally in Canada?
Answer: six core missions


Question: Above 114th Street between Amsterdam Avenue and Morningside Drive, there is a private indoor pedestrian bridge connecting two buildings on the campus of St. Luke's–Roosevelt Hospital Center.
Is there an answer to this question: On which street is a private indoor pedestrian bridge between Amsterdam Avenue and Morningside Drive?

Answer: 114th Street


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A global drop in sea level at the end of the Devonian reversed early in the Carboniferous; this created the widespread epicontinental seas and carbonate deposition of the Mississippian. There was also a drop in south polar temperatures; southern Gondwana was glaciated throughout the period, though it is uncertain if the ice sheets were a holdover from the Devonian or not. These conditions apparently had little effect in the deep tropics, where lush coal swamps flourished within 30 degrees of the northernmost glaciers. A mid-Carboniferous drop in sea-level precipitated a major marine extinction, one that hit crinoids and ammonites especially hard. This sea-level drop and the associated unconformity in North America separate the Mississippian Period from the Pennsylvanian period.
How widespread was the drop in sea llevel in the Carboniferous?
A:
unanswerable