The problem: Answer a question about this article:
The light from LEDs can be modulated very quickly so they are used extensively in optical fiber and free space optics communications. This includes remote controls, such as for TVs, VCRs, and LED Computers, where infrared LEDs are often used. Opto-isolators use an LED combined with a photodiode or phototransistor to provide a signal path with electrical isolation between two circuits. This is especially useful in medical equipment where the signals from a low-voltage sensor circuit (usually battery-powered) in contact with a living organism must be electrically isolated from any possible electrical failure in a recording or monitoring device operating at potentially dangerous voltages. An optoisolator also allows information to be transferred between circuits not sharing a common ground potential.
Where are opto-isolators found?
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The answer: medical equipment


Problem: Please answer a question about the following article about The Blitz:
Nevertheless, it was radar that proved to be critical weapon in the night battles over Britain from this point onward. Dowding had introduced the concept of airborne radar and encouraged its usage. Eventually it would become a success. On the night of 22/23 July 1940, Flying Officer Cyril Ashfield (pilot), Pilot Officer Geoffrey Morris (Observer) and Flight Sergeant Reginald Leyland (Air Intercept radar operator) of the Fighter Interception Unit became the first pilot and crew to intercept and destroy an enemy aircraft using onboard radar to guide them to a visual interception, when their AI night fighter brought down a Do 17 off Sussex. On 19 November 1940 the famous RAF night fighter ace John Cunningham shot down a Ju 88 bomber using airborne radar, just as Dowding had predicted.
Who was the RAF night fighter ace that used airborne radar to destroy a Ju 88 bomber?
A: John Cunningham


Question: Read this and answer the question

In 1900, after Galveston was struck by a devastating hurricane, efforts to make Houston into a viable deep-water port were accelerated. The following year, oil discovered at the Spindletop oil field near Beaumont prompted the development of the Texas petroleum industry. In 1902, President Theodore Roosevelt approved a $1 million improvement project for the Houston Ship Channel. By 1910 the city's population had reached 78,800, almost doubling from a decade before. African-Americans formed a large part of the city's population, numbering 23,929 people, or nearly one-third of the residents.

What event caused an increase in effort to promote the Houston port?
Answer: hurricane


Problem: Sunlight may be stored as gravitational potential energy after it strikes the Earth, as (for example) water evaporates from oceans and is deposited upon mountains (where, after being released at a hydroelectric dam, it can be used to drive turbines or generators to produce electricity). Sunlight also drives many weather phenomena, save those generated by volcanic events. An example of a solar-mediated weather event is a hurricane, which occurs when large unstable areas of warm ocean, heated over months, give up some of their thermal energy suddenly to power a few days of violent air movement.
What is an example of a solar-mediated weather event?
The answer is the following: hurricane


The Philadelphia County Court of Common Pleas (First Judicial District) is the trial court of general jurisdiction for Philadelphia, hearing felony-level criminal cases and civil suits above the minimum jurisdictional limit of $7000 (excepting small claims cases valued between $7000 and $12000 and landlord-tenant issues heard in the Municipal Court) under its original jurisdiction; it also has appellate jurisdiction over rulings from the Municipal and Traffic Courts and over decisions of certain Pennsylvania state agencies (e.g. the Pennsylvania Liquor Control Board). It has 90 legally trained judges elected by the voters. It is funded and operated largely by city resources and employees. The current District Attorney is Seth Williams, a Democrat. The last Republican to hold the office is Ron Castille, who left in 1991 and is currently the Chief Justice of the Pennsylvania Supreme Court.
What type of cases are heard here?
felony-level criminal cases and civil suits above the minimum jurisdictional limit of $7000


Here is a question about this article: 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.
What is the answer to this question: What does continuous torque density refer to?
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So...
method of cooling and permissible period of operation before destruction by overheating