Problem: Light-emitting diode:

An LED filament consists of multiple LED dice connected in series on a common longitudinal substrate that form a thin rod reminiscent of a traditional incandescent filament. These are being used as a low cost decorative alternative for traditional light bulbs that are being phased out in many countries. The filaments require a rather high voltage to light to nominal brightness, allowing them to work efficiently and simply with mains voltages. Often a simple rectifier and capacitive current limiting are employed to create a low-cost replacement for a traditional light bulb without the complexity of creating a low voltage, high current converter which is required by single die LEDs. Usually they are packaged in a sealed enclosure with a shape similar to lamps they were designed to replace (e.g. a bulb), and filled with inert nitrogen or carbon dioxide gas to remove heat efficiently.

Single die LEDs require what?
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A: high current converter

Problem: Richmond, Virginia:

The Richmond area has many major institutions of higher education, including Virginia Commonwealth University (public), University of Richmond (private), Virginia Union University (private), Virginia College (private), South University - Richmond (private, for-profit), Union Theological Seminary & Presbyterian School of Christian Education (private), and the Baptist Theological Seminary in Richmond (BTSRprivate). Several community colleges are found in the metro area, including J. Sargeant Reynolds Community College and John Tyler Community College (Chesterfield County). In addition, there are several Technical Colleges in Richmond including ITT Technical Institute, ECPI College of Technology and Centura College. There are several vocational colleges also, such as Fortis College and Bryant Stratton College.

What is Richmond's public university?
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A: Virginia Commonwealth

Problem: Palermo:

In 2010, there were 1.2 million people living in the greater Palermo area, 655,875 of which resided in the City boundaries, of whom 47.4% were male and 52.6% were female. People under age 15 totalled 15.6% compared to pensioners who composed 17.2% of the population. This compares with the Italian average of 14.1% people under 15 years and 20.2% pensioners. The average age of a Palermo resident is 40.4 compared to the Italian average of 42.8. In the ten years between 2001 and 2010, the population of Palermo declined by 4.5%, while the population of Italy, as a whole, grew by 6.0%. The reason for Palermo's decline is a population flight to the suburbs, and to Northern Italy. The current birth rate of Palermo is 10.2 births per 1,000 inhabitants compared to the Italian average of 9.3 births.

In what year were there 1.2 million homes in the Palermo area?
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A: unanswerable

Problem: Canadian Armed Forces:

The Canadian Army is headed by the Commander of the Canadian Army and administered through four divisionsthe 2nd Canadian Division, the 3rd Canadian Division, the 4th Canadian Division and the 5th Canadian Divisionthe Canadian Army Doctrine and Training System and the Canadian Army Headquarters.

The Canadian Army Headquarters are located in what division?
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A:
the 5th Canadian Division