WATERLOO, ON, Oct. 12, 2011 - Black holes are hot! This discovery made by Stephen Hawking ties together gravity, spacetime, quantum matter, and thermal systems into the beautiful and exciting science of "black hole thermodynamics". Its beauty lies in the powerful way it speaks of the unity of physics. On Wednesday, November 2, as part of Perimeter Institute's Public Lecture Series presented by Sun Life Financial, Fay Dowker, Professor of Theoretical Physics at Imperial College, London, UK, will describe black hole thermodynamics and argue that it is telling us that spacetime itself is granular or "atomic" at very tiny scales. Fay Dowker completed her PhD with PI Distinguished Research Chair Stephen Hawking at the University of Cambridge. She has done postdoctoral work at Fermi National Accelerator Laboratory, University of California at Santa Barbara, and California Institute of Technology. She held a lectureship at Queen Mary, University of London before moving to Imperial College. Her research interests are in quantum gravity and especially causal set theory, and in the foundations of quantum mechanics. Professor Dowker's lecture, entitled "Spacetime Atoms and the Unity of Physics" will be held Wednesday, November 2 at 7:00 PM ET in Waterloo, Ontario. Tickets will be available starting Monday, October 17th, 2011. Further details can be found at www.perimeterinstitute.ca.