Quantum computing promises to supercharge scientific research with its ability to solve multiple problems all at once. It could lead to more rapid development of drugs and materials to improve the way we live. But first, there are some serious bugs that have to be overcome.  Dr. Kade Head-Marsden, a chemist at the University of Minnesota, who uses quantum computers to study molecules, lays it all out for us; what is quantum computing, how will it help us, what are the promises and pitfalls.  Her presentation, excerpted from a live talk sponsored by Telluride Science, was moderated by veteran broadcast journalists Judy Muller and George Lewis.