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.

A hypothetical method of decay for these particles involves breaking into a positron and a neutral pion and would have a half-life on the order of 10 to the 35 years. In astronomy, these particles are employed in a namesake chain located in the cores of stars in order to synthesis lighter elements. Particles of this type are typically composed of two up quarks and a single down quark and these particles make up about 90% of all cosmic rays. Discovered by Ernest Rutherford, for 10 points, identify this subatomic particles that contributes the positive charge of an atoms nucleus.
Science

One character in this work pretends to sing a fashionable song from "The Vain Precaution" in a scene that ends in the quintet "Buona Sera". This opera's tenor pretends to be a drunken soldier when he meets the servant girl Berta, while in the aria "Calumny is a little breeze", Doctor Bartolo receives advice from Don Basilio. Its popular overture was intended for its composer's Aureliano in Palmira, while its first act sees Rosina describe her love for Lindoro in "Una voce poco fa". This opera's title character first appears singing the aria "Largo al Factotum" and aids Count Almaviva in wooing Rosina. For 10 points, name this opera about Figaro, composed by Gioacchino Rossini.
Fine Arts

This artist took a series of pictures of clouds, known as Equivalents. A woman walking several feet in front and to the side of a man carrying two long sticks, and a man sitting on a wood pile feeding a horse are his two photographs with the title A Snapshot: Paris. He published the magazine Camera Work as part of his Photo-Secession movement, and one of his early works shows a carriage head-on riding toward snow with wheel tracks in it. He took several photos of his wife's hands in various positions, and showed a man with his back turned from the viewer looking at a horse-drawn trolley in one photograph. Besides Winter, Fifth Avenue and The Terminal. Another of his works features a narrow drawbridge with side chains, a deck, a ladder, and an "inclining funnel", all at different angles, while crowds of people fill the title section of the ship. For 10 points, name this photographer of The Steerage, the husband of Georgia O'Keeffe.
Fine Arts