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.

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.
Science

Its official beginning was the attempted murder and subsequent suicide committed by Mangel Pande, whose unit was disbanded by General Hearshey as a result. Three weeks later, the 3rd Light Cavalry openly refused orders, and fighting soon spread from Meerut, with the greatest violence coming at Cawnpore and the siege of Lucknow. The arrival of reinforcements under Colin Campbell led to its eventual end in 1859. Catalyzed by the use of beef and pork fat in Enfield rifle cartridges, FTP, name this 19th-century rebellion against the British in northern India.
History

Their spectra are similar to those of Seyfert Galaxies, and the BL Lac objects were once classified as a type of these. The spectra of many of these objects contain a series of absorption lines at the Lyman alpha transition wavelengths. 3C 273 was the first of these objects discovered by Sandage and Mathews in the Virgo cluster, and its spectrum indicated its redshift implied it had 90% of the velocity of light. Some of these objects have been measured to be as far away as thirteen billion light years. For 10 points, name these objects, believed to be an accretion disk powered by a supermassive black hole, and the oldest, farthest, and brightest objects detected in the night sky.
Science