Come September, you have detected gravitational waves. What does that allow us to explore and understand that we did not before? I have long thought that the most likely thing for us to see first is collision of two black holes and if that's what we see, we will then be for the first time opening up a study of geometrodynamics. How does warp space and warp time behave in a storm? It says though we've only seen the surface of the ocean on a calm day. We've never seen a storm where they're rolling waves, breaking waves, where there might even be water spouts. And similarly we've never seen how warp space behaves and warp time behaves in a storm. I think the goal of this and the great excitement is not detecting gravitational waves. It's not discovering proving that they're there. It's using them to explore aspects of the universe that we have never ever seen. This is going to be a number of things we'll be discovered that are very unexpected. Some things will be proved that you didn't know whether they were true or not. But this is a tool for doing a rich variety of science. For example, if you have a compact binary system, say, two neutron stars, a neutron star black hole, black hole black hole, they will be inspiring into towards each other, slowly getting closer their orbital period, decreasing with time as they grow closer together. What you would expect to see there is a signal with slowly increasing frequency, a chirp signal. And then as they go closer and merge, you'll get this fantastically messy signal. You get two black holes merging with each other. That's crazy. And you get this new black hole created. It's excited and releases energy and gravitational waves. And it will ring down at characteristic frequencies. It will tell you things about the massive, the new black hole and the spin. Since I got started, I've always thought that probing what's going on right in the center of black holes or right at the outside of black holes where the curvature of space becomes so wild. I thought that was always the most interesting part of this project. The theory seems so wild to me. I always thought it can't be. It can't be just like that. So this would be our first way to really get a handle on the space curve of the way that people have been predicting all along. Or something really even more wild happened at the edge when the black hole is merged and the curvature becomes really high. New particles created or desired knowledge of space time completely break down. Maybe we don't know what space is at all. The deepest, most fundamental physics, these are the kinds of things we could discover. When I first started my career at Caltech, roughly a half a century ago, what I wanted to do was discovering how, what happens then. This is the most wild of imaginable situations for space and time. How does space and time behave? The LIGO is going to show us. We will see this for the first time. It will open up our eyes into deep physics that we have not previously understood. Our insights, our understanding of space and time will be completely different in 20 years from now because of LIGO plus computer simulations than it is today. That's just one example of the great richness of things that this is going to do for human understanding of the universe. You