Webcasts for various courses I teach at UCL. The image shows part of the charge density for a structure made of germanium which self-assembles on silicon, calculated using the linear scaling density functional theory (DFT) code, Conquest, which I develop. See http://www.order-n.org/ for more details. You can also look at the blog for my book, Atomistic Computer Simulations, at http://www.atomisticsimulations.org/