In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

One variant of this phenomenon can be used to tune the electronic properties of boron nitride nanotubes from nearly insulating to metallic. Another variant of this phenomenon is induced by interference of standing laser waves to trap atoms of a Bose-Einstein condensate loaded into an optical lattice. Schrdinger's third article from his 1926 series of papers presented his perturbation theory treatment of this effect's modification of the Balmer and Lyman series. Along with van der Waals broadening and resonance broadening, this effect can produce pressure broadening of spectral lines. In addition to the giant version and the AC or Autler-Townes form of this effect, it exhibits variants that are linear and quadratic in the applied field. FTP name this shifting and splitting of spectral lines due to an external electric field, the analogue of the Zeeman effect.
Science

It begins in Scythia, in a locale characterized as "the world's limit an untrodden desolation. "  The title character doesn't speak until after Kratus and Bia, or Might and Violence, have left, soon after which he is visited by a Chorus of Ocean Nymphs, who like Hephaestus sympathize with the title character. It is to Oceanus that the title character recounts his tale, beginning with the war between the Gods and Titans. FTP, name this Aeschylus play about the tortured Titan whose foresight helped him give hope and fire to Man.
Literature

The extraction process for this element requires grinding it up and leeching with sulfuric acid, converting its dioxide into a trioxide. Afterwards, it is enriched by adding elemental fluorine to form its hexafluoride, which is then converted back into the dioxide for conversion into the pellets for its best known use. Available from the pitchblende, this element converts into thorium and potassium in the Earth's core and contains the radioactive 238 isotope. For 10 points, identify this actinide used in nuclear power plants, symbolized U.

Science

