Problem: Printed circuit board:

Electrochemical migration (ECM) is the growth of conductive metal filaments on or in a printed circuit board (PCB) under the influence of a DC voltage bias. Silver, zinc, and aluminum are known to grow whiskers under the influence of an electric field. Silver also grows conducting surface paths in the presence of halide and other ions, making it a poor choice for electronics use. Tin will grow "whiskers" due to tension in the plated surface. Tin-Lead or solder plating also grows whiskers, only reduced by the percentage Tin replaced. Reflow to melt solder or tin plate to relieve surface stress lowers whisker incidence. Another coating issue is tin pest, the transformation of tin to a powdery allotrope at low temperature.

In addition to "whiskers," what does silver sprout around ions like halide?
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A: conducting surface paths


Problem: The continuous torque density of conventional electric machines is determined by the size of the air-gap area and the back-iron depth, which are determined by the power rating of the armature winding set, the speed of the machine, and the achievable air-gap flux density before core saturation. Despite the high coercivity of neodymium or samarium-cobalt PMs, continuous torque density is virtually the same amongst electric machines with optimally designed armature winding sets. Continuous torque density relates to method of cooling and permissible period of operation before destruction by overheating of windings or PM damage.
How does non-continuous torque density vary between well designed motors?
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Answer: unanswerable


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
In December 2008, the CTO of Blitz Games announced that it would bring stereoscopic 3D gaming and movie viewing to Xbox 360 and PlayStation 3 with its own technology. This was first demonstrated publicly on PS3 using Sony's own technology in January 2009 at the Consumer Electronics Show. Journalists were shown Wipeout HD and Gran Turismo 5 Prologue in 3D as a demonstration of how the technology might work if it is implemented in the future. Firmware update 3.30 officially allowed PS3 titles to be played in 3D, requiring a compatible display for use. System software update 3.50 prepared it for 3D films. While the game itself must be programmed to take advantage of the 3D technology, titles may be patched to add in the functionality retroactively. Titles with such patches include Wipeout HD, Pain, and Super Stardust HD.
What word describes what happens to a game when is edited to remove functions not originally programmed?
A: unanswerable


Context and question: As the economic situation worsened MacDonald agreed to form a "National Government" with the Conservatives and the Liberals. On 24 August 1931 MacDonald submitted the resignation of his ministers and led a small number of his senior colleagues in forming the National Government together with the other parties. This caused great anger among those within the Labour Party who felt betrayed by MacDonald's actions: he and his supporters were promptly expelled from the Labour Party and formed a separate National Labour Organisation. The remaining Labour Party MPs (led again by Arthur Henderson) and a few Liberals went into opposition. The ensuing 1931 general election resulted in overwhelming victory for the National Government and disaster for the Labour Party which won only 52 seats, 225 fewer than in 1929.
How did people in the Conservative Party feel about MacDonald's actions?
Answer: unanswerable


Question: Roman Catholic and more traditional Protestant clergy wear green vestments at liturgical celebrations during Ordinary Time. In the Eastern Catholic Church, green is the color of Pentecost. Green is one of the Christmas colors as well, possibly dating back to pre-Christian times, when evergreens were worshiped for their ability to maintain their color through the winter season. Romans used green holly and evergreen as decorations for their winter solstice celebration called Saturnalia, which eventually evolved into a Christmas celebration. In Ireland and Scotland especially, green is used to represent Catholics, while orange is used to represent Protestantism. This is shown on the national flag of Ireland.
Is there an answer to this question: What was worshipped for their ability to maintain their color through the winter season?

Answer: evergreens


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The primary responsibility for a boy's studies lies with his House Master, but he is assisted by an additional director of studies, known as a tutor. Classes, colloquially known as "divs" (divisions), are organised on a School basis; the classrooms are separate from the houses. New school buildings have appeared for teaching purposes every decade or so since New Schools, designed by Henry Woodyer and built 1861-3. Despite the introduction of modern technology, the external appearance and locations of many of the classrooms have remained unchanged for a long time.
What is New Schools colloquially known as?
A:
unanswerable