Explore a 47-minute conference talk by Gabriel Aeppli from ETH Zurich on the observation and anomalous properties of the long-sought flat optical mode in a metallic Kagome system. Delve into recent developments in the interplay between topology, symmetry, and interactions in condensed matter physics. Examine the effects of correlations on topological insulators, semimetals, and superconductors, and investigate how symmetry and strong correlations produce correlated topological phases in Kondo systems. Discover the connections between Moire heterostructures, higher-order topology, and fracton systems, and explore the potential of topology as a framework for understanding strongly correlated gapless phases. Gain insights into the unifying themes of electronic topology across various materials and correlation strengths, presented as part of the Kavli Institute for Theoretical Physics conference on quantum crystals and electronic topology.