This is an article about using the social learning tool Perusall. It allows students to think through historical problems critically, and guides them in using sources like a historian. From source: "For many students, completing readings before class entails looking at every word and hoping that they understood and retain the most important information. In its most basic implementation, Perusall offers a way for instructors to ensure that students are doing the readings and engaging them to a minimum. Students annotate, ask questions, and discuss the materials directly on the platform. The utility of Perusall is obvious in general education survey courses, in which getting students to do the reading is an especially common problem. However, this simple grade-based motivation is not Perusall’s most valuable contribution to a class. The deeper level of engagement and active reading it facilitates is an even greater asset."