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: The reciprocal relationship between the eigenvalues of the mass matrix of these particles is called the "seesaw mechanism"; the larger eigenvalue may be the mass of their "sterile" variety. One phenomenon predicted by Pontecorvo involving these entities was searched for by (*) MINOS. Reines and Cowan used an aqueous cadmium chloride solution to detect them, and other detectors tend to include large volumes of material, such as Super Kamiokande. For 10 points, name these leptons, the nearly massless products of radioactive decay whose varieties include the muon and tau and which are represented by the letter nu.

SOLUTION: Science

PROBLEM: This philosopher argued that the only way to exercise freedom is to act morally, because otherwise one's actions are bound by one's conditional desires. This thinker defined the title concept of one of his essays as "man's emergence from his self-imposed immaturity." He postulated that our senses perceive only phenomena and not noumena, so we can never truly know the "thing-in-itself." This author of "What is Enlightenment" argued that we should act only according to maxims that could be made universal law, which he called the "categorical imperative." For 10 points, name this German author of Groundwork of the Metaphysics of Morals and Critique of Pure Reason.

SOLUTION: Social Science

PROBLEM: Vaihinger discussed the relation between Swedenborg and this man's concept of two worlds, in a commentary on this man's Dreams of a Spirit Seer. He proposed the creation of a league to mediate international disputes in his essay "Perpetual Peace," and defined ratiocination as the judgment of a predicate with its subject in "The False Subtlety of the Four Syllogistic Figures. " He defined his best-known concept by claiming that nothing can be called good without qualification "except a good will" in his Foundations of the Metaphysics of Morals. For 10 points, name this author of The Critique of Judgment and Critique of Pure Reason who created the "categorical imperative. "

SOLUTION:
Social Science