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This lecture covers importance sampling techniques in Monte Carlo calculations, focusing on changing variables in integrals to improve efficiency. It explains the concept of rewriting integrals, properties of the new function, and provides examples to illustrate the process. The importance of selecting the right distribution function for sampling is emphasized, along with the impact on the accuracy of the results. The lecture concludes with a discussion on the scaling of importance sampling with dimensions, showcasing how the technique can significantly enhance computational efficiency in higher-dimensional spaces.