In Our Time

If you're looking for a meaty podcast experience, I recommend In Our Time, a program from BBC Radio 4.

It's an hour-long program hosted by Melvyn Bragg, usually with three guests, that has enough time to delve pretty deeply into a variety of topics. One of the things that is most impressive is the unbelievably wide breadth of topics, some of which are quite interesting, others things you just haven't heard of before.

Recent episode subjects include:

• Bismark
  
• Anaesthetics - from ether frolics to pain-free surgery
  
• The Opium Wars
  
• St. Hilda
  
• The History of Optics
  

They also have a cool subject cloud.

(subscribe to podcast)