Explore Drinfeld's lemma for schemes in this 58-minute seminar talk by Kiran Kedlaya, a visiting professor from the University of California, San Diego. Delivered as part of the Joint IAS/Princeton University Algebraic Geometry Seminar, delve into topics such as fundamental groups, base points, and the Stax project. Examine the proof of Drinfeld's lemma, including a special case analysis, and gain insights into the QQCSA fine line. This advanced mathematical discussion offers a deep dive into algebraic geometry concepts for researchers and enthusiasts in the field.