iTunes description: "Design is everywhere in our lives, perhaps most importantly in the places where we've just stopped noticing. 99% Invisible is a weekly exploration of the process and power of design and architecture."

Why it's on the list: Listen to enough episodes and you'll never be able look at the world in the same way again. Plus, host Roman Mars could make the history of the water fountain interesting—and he has.

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Episode to start with: "Guerrilla Public Service"