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.

Q: This rule holds if the operator algebra for some set of observables is non-trivial; that is true because it is derived via the Schwarz inequality applied to the expectation value of the commutator of two observables operators. It formally bounds the product of the dispersions in two observables. An adapted form of this law applies to energy and time; it applies directly to any two components of spin, but it is best known in its application to position and momentum, the product of the standard deviations of which is at least h-bar over two. FTP, name this principle from quantum mechanics that limits the precision of measurements.

A: Science
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Q: 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.

A: Science
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Q: In response to this scandal, Bill Breeden was jailed for stealing the sign of a street named after a participant, leading Howard Zinn to deem him the "only person to be imprisoned as a result" of this scandal. Secretary Fawn Hall shredded several documents pertaining to this scandal, which caused John Poindexter's resignation. It was investigated by the (*) Tower Commission and it violated the Boland Amendment, which forbid US assistance to a certain Nicaraguan rebel group. For 10 points, name this scandal that implicated Oliver North and Ronald Reagan in the sale of arms to Ayatollah Khomeini's government in order to fund some Latin American rebels.

A:
History
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