Explore the dynamics and symmetry of ancient convex mean curvature flows in this lecture by Sigurd Angenent from the University of Wisconsin-Madison. Delivered as part of the International School on Extrinsic Curvature Flows, this 67-minute talk delves into the intricacies of mean curvature flow, focusing on ancient solutions and their properties. Gain insights into the mathematical concepts underlying these geometric flows and their applications in differential geometry and related fields.