Sumit Paul-Choudhury is an astrophysicist-turned-journalist, former editor-in-chief of New Scientist magazine and has served as a judge for the Baillie Gifford Prize (then Samuel Johnson Prize), the Wellcome Prize and the Costa Book Awards. On this week’s episode of Little Atoms he talks to Neil Denny about his new book The Bright Side: Why Optimists Have the Power to Change the World.

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