Earlier this month, Invisibilia celebrated its fifth birthday. As one of NPR‘s most popular podcasts, it deals with the invisible forces behind why we do what we do, think what we think, feel how we feel, and believe what we believe. And despite tackling serious topics — its newest season promises to be an “emotional survival guide,” and its first episode focuses on pain — the tone remains light, as its two hosts, Alix Spiegel and Hanna Rosin, share their genuine fascination with the brain and its workings. Past episodes have answered questions like: Do you need eyes to see? Can pain cure…

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