Explore the fascinating intersection of mathematics and biology in this 46-minute conference talk delivered by James Keener from the University of Utah at the Joint Mathematics Meetings 2020 in Denver. Delve into the concept of diffusion and its crucial role in biological processes as Keener presents the SIAM Invited Address, demonstrating how mathematical principles can be applied to understand and explain complex life phenomena. Gain insights into how diffusion can be leveraged as a powerful tool in biological systems and discover the elegant ways in which mathematical modeling contributes to our understanding of life sciences.