Given the task definition and input, reply with output. 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.

Haag, Lopuszanski, and Sohnius showed in 1975 that this concept is the maximal possible extension of the Poincare type. It does so without violating the Coleman-Mandula theorem by transforming particles into particles that differ from the original by one-half unit of spin. This prediction of string theory states that at higher energy scales, every boson should have a fermion partner and vice versa. Examples of predicted particles include the selectron and the squark. FTP, identify this idea that results from superstring theory.
Science