Pentaquarks doubly heavy exotic mesons and baryons and how to look for them

I discuss the experimental evidence for and theoretical interpretation of the new mesons and baryons with two heavy quarks These include doubly heavy baryons exotic hadronic quarkonia and most recently a manifestly exotic pentaquark like doubly heavy baryon with a minimal quark content uud bar c discovered by LHCb whose mass decay mode and width are in agreement with a prediction based on a physical picture of a deuteron like hadronic molecule Refreshments are served at 3:20pm