Today's particle seminar by Sergei Dubovsky will start at 5:00, rather than 4:15: Tuesday, March 25, 2014 @ 5:00 PM Harvard University Particle Seminar “Integrable quantum gravity and the hierarchy problem” Sergei Dubovsky (NYU) Jefferson Lab, 453 Refreshments in the high energy theory coffee area, 4th floor Jefferson, at 4:45pm.