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The Crisis in Quantum Gravity
I think the quantum gravity is a very weird thing. It's experimentally very, very difficult to think about. While we've made sort of more progress than we really have any right to expect honestly in quantum gravity. And maybe we will continue to do that. Maybe we'll continue to get lucky. But the fact that we're not done yet and haven't figured out exactly the path from M theory to the standard model particle physics "in my mind is the least surprising thing in the world," he says.