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Ep. 52 - Are Some Infinities Bigger Than Others? | Dr. Toby Meadows
Does infinity really come in multiple sizes? According to mathematical orthodoxy, some infinities are bigger than others - but that's awfully hard to wrap your mind around. 

So, I've asked Dr. Toby Meadows from the University of Queensland to help me out. He specializes in the philosophy of mathematics and set theory.