Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
FETs are divided into two families: junction FET (JFET) and insulated gate FET (IGFET). The IGFET is more commonly known as a metal–oxide–semiconductor FET (MOSFET), reflecting its original construction from layers of metal (the gate), oxide (the insulation), and semiconductor. Unlike IGFETs, the JFET gate forms a p–n diode with the channel which lies between the source and drain. Functionally, this makes the n-channel JFET the solid-state equivalent of the vacuum tube triode which, similarly, forms a diode between its grid and cathode. Also, both devices operate in the depletion mode, they both have a high input impedance, and they both conduct current under the control of an input voltage.
What are the names of the groups of FETs
A: junction FET (JFET) and insulated gate FET (IGFET)

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The assumption that black-body radiation is thermal leads to an accurate prediction: the total amount of emitted energy goes up with the temperature according to a definite rule, the Stefan–Boltzmann law (1879–84). But it was also known that the colour of the light given off by a hot object changes with the temperature, so that "white hot" is hotter than "red hot". Nevertheless, Wilhelm Wien discovered the mathematical relationship between the peaks of the curves at different temperatures, by using the principle of adiabatic invariance. At each different temperature, the curve is moved over by Wien's displacement law (1893). Wien also proposed an approximation for the spectrum of the object, which was correct at high frequencies (short wavelength) but not at low frequencies (long wavelength). It still was not clear why the spectrum of a hot object had the form that it has (see diagram).
What does the Stefan-Boltzmann law state?
A: the total amount of emitted energy goes up with the temperature according to a definite rule

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In styles that owe as much to videogame pixel art and popculture as to traditional mosaic, street art has seen a novel reinvention and expansion of mosaic artwork. The most prominent artist working with mosaics in street art is the French Invader. He has done almost all his work in two very distinct mosaic styles, the first of which are small "traditional" tile mosaics of 8 bit video game character, installed in cities across the globe, and the second of which are a style he refers to as "Rubikcubism", which uses a kind of dual layer mosaic via grids of scrambled Rubik's Cubes. Although he is the most prominent, other street and urban artists do work in Mosaic styles as well.
How does the French Invader create "Rubikcubism" styled mosaics?
A: grids of scrambled Rubik's Cubes

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Soon, Laemmle and other disgruntled nickelodeon owners decided to avoid paying Edison by producing their own pictures. In June 1909, Laemmle started the Yankee Film Company with partners Abe Stern and Julius Stern. That company quickly evolved into the Independent Moving Pictures Company (IMP), with studios in Fort Lee, New Jersey, where many early films in America's first motion picture industry were produced in the early 20th century. Laemmle broke with Edison's custom of refusing to give billing and screen credits to performers. By naming the movie stars, he attracted many of the leading players of the time, contributing to the creation of the star system. In 1910, he promoted Florence Lawrence, formerly known as "The Biograph Girl", and actor King Baggot, in what may be the first instance of a studio using stars in its marketing.
What was started in June 1910?
A:
unanswerable