i love their show, the sound is like a third player in this conversation.
highly educational, and with personality, the best science radio show i've ever heard.
even people i know who don't retain info from solely audio input follow these guys as they expand and twist subjects, and watch as they return to shape, but not the same.
i learned of this show from ira glass and T.A.L.
i haved turned many on to this show, if you havn't.....you should.