As a boy, Oren Harman set up his own bedroom "laboratory" to uncover the caterpillar's transformation into a butterfly. But these marvellous creatures are far from alone in radically transforming: it is thought that 75% of animal life undergoes a form of metamorphosis. The story of how and why is one that has puzzled some of the most remarkable minds in history, from Aristotle onwards; in his new book Metamorphosis, Oren tells their story. He joins us on this episode of the podcast to reveal more.

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