Explore the second lecture in a series on Stein's restriction conjecture and the polynomial method in restriction theory. Delve into the intricacies of estimating functions with Fourier transforms supported on hypersurfaces, such as spheres in Rn. Examine the decomposition of these functions into sums over wave packets supported on long, thin tubes. Learn about Guth's introduction of the polynomial method in restriction theory and its application to studying tube intersections. Gain a comprehensive understanding of Stein's restriction conjecture, the Kakeya conjecture, and the innovative use of the polynomial method in addressing these mathematical challenges. This 58-minute lecture, presented by Hong Wang at the Hausdorff Center for Mathematics, offers an in-depth exploration of advanced concepts in harmonic analysis and geometric measure theory.