Please add to your list of events: Thursday, October 11, 2007, 4:00 pm Harvard-Smithsonian Center for Astrophysics CfA Colloquium Series Phillips Auditorium, 60 Garden Street, Cambridge "X-Ray Emitting Clusters of Galaxies - How Do They Work and How Can We Use Them?" Jeremiah P. Ostriker Princeton University tea and cookies at 3:30 p.m. http://www.cfa.harvard.edu/events/colloquia