TASK DEFINITION: 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.
PROBLEM: An approximation of it named for Russell uses the TDS value to determine one of its parameters via the Langelier approximation, while one constant that appears in it has units of moles per kilogram to the one half power, according the Bates-Guggenheim convention. Along with Guggenheim, Scatchard and Bronsted improved upon this model by developing the SIT theory, and that model has a better fit than a modification of it named for Davies. This relationship assumes the existence of only long-range interactions, and it was extended to account for Brownian motion by Lars Onsager. It assumes that the solvent is structure-less and that the solution is dilute, and the theory behind it implies that the electrostatic potential falls off exponentially when r is greater than the atomic radius due to screening by counter ions. For 10 points, identify this equation which is used to calculate the activity coefficients, and is named for a German and a Dutch scientist. 

SOLUTION: Science

PROBLEM: This play opens with a midday meeting in which a man berates his friend for his alcoholism and lends him a tie and comb. This play's first act sees a grocer obsessively try to win back the business of a housewife, whose cat dies in the ensuing action. In another part of this play, an Old Gentleman hears that his dog must be a cat from a Logician that explains syllogisms. Dudard's professional success worries this play's central character, who suggests to Daisy that they repopulate the human race before she leaves him for not understanding love. For 10 points, name this absurdist play by Eugene Ionesco in which everyone but Berenger grows horns and turns into the title animal.

SOLUTION: Literature

PROBLEM: writer from this country wrote about "the Sorceror" who calls his third testicle his sister Estrella in the novel The Lizard's Tale. Another writer from here wrote about anti-hero Remo Erdosain, who gets caught up with a man known as The Astrologer, in the novel The Seven Madmen. In addition to Luisa Valenzuela and Roberto Arlt, another writer of this nation wrote the novel The Angel of Darkness and told of surrealist painter Juan Pablo Castel who murders his beloved Maria Iribarne in the novel El Tnel. Another novel from this nation centers around a man who gives the name Faustine to a woman who speaks of Canada, only to discover that the two suns and two moons he observes on the supposed island of Villings are the result of twin realities. In addition to Ernesto Sabato and Adolfo Bioy Casares, another writer from here tells of a man who travels with Sergeant Cruz and battles a black payador. FTP, name this birthplace of the author of Martin Fierro and the author of "The Garden of Forking Paths. "

SOLUTION:
Literature