Explore a 45-minute conference talk on local fluctuations in the shear modulus of granular beds, presented by Corey O'hern from Yale University. Delve into cutting-edge research on geophysical and environmental multiphase flows, focusing on the physics of particle-laden systems. Gain insights from this presentation, part of the "Atmospheres, Oceans, Earths -- Unifying perspectives on geophysical and environmental multiphase flows" conference held at the Kavli Institute for Theoretical Physics. Discover how field observations, laboratory experiments, numerical simulations, and theoretical approaches contribute to our understanding of complex multiphase geophysical flows, from cloud dynamics to granular material transport over erodible surfaces.