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Weirder and Weirder: Hannah discusses a paradox discovered by Bertrand Russell that undermines the foundations of logic underpinning math, suggesting that math isn't a true part of the universe. But Einstein's equations are so good at predicting the universe that they must reflect some basic structure in it. Even weirder, the two main theories about the universe--quantum physics and general relativity--are incompatible.

Starring: Hannah Fry.