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Mathematician Dr. Hannah Fry explores the mystery of math. It underpins so much of our modern world that it's hard to imagine life without its technological advances, but where does math come from? In this episode, Hannah goes back to the time of the ancient Greeks to find out why they were fascinated by the connection between beautiful music and math. She also meets experts who study the structure of viruses, experiment with infant understanding, and utilize the concept of imaginary numbers. The question of whether math is invented or discovered just got a whole lot more difficult to answer.