Podcasts -- seeking recommendations

I remember my first podcast. naomikritzer mentioned she had a story on PodCastle. That was #39, and I ended up downloading everything on PodCastle and Escape Pod to date. It became a morning habit, just like (I suppose) morning drive radio for more normal people. I have a window most days of half an hour to an hour where a podcast is the perfect thing. It took me several years to work my way through the backlog, but I recently caught up, which means I get one new story a week.

Back then, I also subscribed to a bunch of recurring stuff from NPR: Wait Wait Don't Tell Me, Science Friday, and This American Life. Also the Savage Love podcast. Pretty soon, I was several weeks behind on those, and had to unsubscribe. Then anghara mentioned the BBC's A History of the World in 100 Objects. It took several months to work my way through it, but I finally did. The very last item in the subscription was a promo for Shakespeare's Restless World, which purports to describe the world of Shakespeare in 20 objects. I just subscribed to that one.

But now I'm looking for more, and I'd welcome suggestions, particularly ones based on these parameters:

• Because it's a limited block of time, I prefer shortish podcasts -- 45 minutes or less. (The giant episodes on Escape Pod and PodCastle take me several days to listen to.)
  
  
• I have a preference, though not an absolute one, for educational material rather than fiction, because I listen to fiction (audiobooks) for my car/exercise listening on the iPod, and this should be something different.
  
  
• I am generally allergic to politics, unless the politics are at least 100 years old.
  
  
• It shouldn't be something where I'll feel as if I'm on a treadmill that I have to keep up with, or it will run me over (see NPR above).

Podcasts of fan fiction don't really work in this context, because I want new material, and in fan fiction podcasts, I'm usually looking for an audio version of an existing favorite.