Eric Furst from the University of Delaware is an expert in self-assembly -- the Harry Potter-esque ability of materials to assemble themselves into well-defined structures. We talk about where we are, where we are going, and what makes controlling self-assembly so hard. A variety of topics make cameos, including M&Ms, NASA's Vomit Comet, flying solar cells, and more. (Recorded on April 19, 2017. Edited by Andrew Cannon)