Podcasts from the University of Oxford podcasts series in which Oxford mathematicians explore the power and beauty of their subject. Recent topics have included Sir Roger Penrose describing how crystalline symmetries are necessarily 2-fold, 3-fold, 4-fold, or 6-fold; Professor Marcus du Sautoy, Charles Simonyi Chair in the Public Understanding of Science, talks about the connections between art and mathematics and Professor Gui-Qiang G. Chen presents in his inaugural lecture several examples to illustrate the origins, developments, and roles of partial differential equations in our changing world. The site provides full information on each speaker and a summary of content; keywords are linked so topics can be searched across the various podcasts.