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Still struggling with chance
Are there objective chances in the world?
Saul Schleimer and Henry Segerman show off some of their beautiful 3D printed mathematical structures.
Why does time only ever move in one direction? We talk to philosophers of physics Jeremy Butterfield and David Wallace, as well as the eminent Roger Penrose about the puzzle time poses to physicists and what it has to do with the Big Bang and the second law of thermodynamics.