Bronson Messer: "Gravitational Wave Astronomy"
One black hole is fun. Having TWO black holes, though, is awesome! You can slam them into one another! But, how can you tell anything happened? Gravitational waves -- ripples in spacetime itself -- are the answer. We have now observed GWs from colliding black holes and colliding neutron stars (these are even more fun: they make gold!). We'll talk a little about how hard astronomy with GWs is, how we were able to do it anyway, and how huge computer simulations can help us make sense of the data.