Dr. Steven Novella hosts a small panel of scientists (including one or two other Novellas) for the hour-plus podcast The Skeptics Guide to the Universe. Once a subject is introduced a spirited discussion follows. Skepticism is the underlying theme. Many of the subjects are commonly held beliefs, the validity of which, upon further examination either come under question or are thoroughly debunked. It's a good-natured group, kind of like being in the smart guys locker room as they laugh and cajole over tales of astrophysics and the speed of light.