Ted Radio Hour
Host: Guy Raz
The famous presentation series on technology, education, and design is probably most popular by way of its YouTube presence, but that thoughtful, heady content is also available in a more easily digestible audio form. Thought leaders working on all kinds of amazing problems can catch you up with what they're doing, and you don't even have to move your hands from the steering wheel or dumbbell.
Best Episode: Hugh Herr's remarkable presentation on how he literally reinvented himself after a near-death experience by inventing his own robotic legs is a clear standout.