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

A functor named for this mathematician can be interpreted as the first group homology group with integral coefficients. A cellular automaton discovered by Bak, Tang, and Wiesenfeld that displays self-organized criticality is a "sandpile model" named for him. This mathematician names a class of theorems showing that various summation methods are regular, i.e., that they give the correct result for convergent series. Grothendieck introduced categories named for this mathematician in his Tohoku paper; those categories are a general setting for homological algebra and allow morphisms and objects to be added. This non-Italian mathematician gave the first complete proof of the insolubility of the quintic by radicals. Groups that satisfy the commutative law and many other mathematical concepts are named for, FTP, what Norwegian mathematician who died at the age of 26, thus making everyone else look like a chump
Science

Wallace Stevens described this figure singing and chanting the things that are part of him in the poem Like Decorations in a Nigger Cemetery. In the poem A Pact, Ezra Pound writes that this figure broke the new wood [and]/Now is a time for carving. In a 1930 ode to him, another poet describes this earlier writer moaning like a bird/with its sex pierced by a needle and a group of young men chasing his beard full of butterflies"; that is a Garcia-Lorca homage citing this writers putative homosexuality. This poet described a carpenter measuring out a plank in I Hear America Singing. For 10 points, name this nineteenth-century poet whose barbaric yawp was sounded in works like Crossing Brooklyn Ferry and Song of Myself.
Literature