Every weekday on the radio, and weekly on its podcast, the program spends an hour delving deeply into its title. Its documentary producers talk to politicians, physicians, scientists, theologians, philosophers, poets, artists, writers, historians, and others about topics as diverse as China's 15th century naval fleet, the modern relevance of Don Quixote, theoretical physics, Picasso and the musical avant-garde in Paris during the 1920s, and golf.
And that's just this week. I heard bits (alas, only bits) of the Chinese navy broadcast last night while I was running errands, and was entranced. I sat in the drugstore parking lot for a few minutes because I couldn't tear myself away.
There is a separate feature page (with RealAudio streams! Who still uses that?) and podcast (with proper MP3s) for the ongoing series "How to Think About Science," which started last year. There are already 17 hours in that group of shows alone.
"Ideas" will grow your brain. I recommend you dedicate some time to it.