Explore the fourth lecture on Regularization by Noise delivered by Mario Maurelli as part of the program on Deterministic and Stochastic Analysis of Euler and Navier-Stokes Equations. Delve into advanced mathematical concepts related to fluid mechanics, focusing on the regularization effects of noise in partial differential equations. Gain insights into recent developments in the field, including the Onsager conjecture, weak solutions to Euler and Navier-Stokes equations, and stochastic convex integration methods. Benefit from the expertise of leading researchers in this 1 hour and 33 minute lecture, designed for PhD students, postdocs, and faculty members working on mathematical aspects of fluid flow equations.