Science & the City has three interesting podcasts:
The first one is Future of the Stockmarket, in which investors, economists, and quantitative finance experts discuss how technological innovations have hastened the growth of the markets.
The second piece is Physics of the Impossible. The cofounder of string field theory offers a scientific exploration of the world of phasers, force fields, teleportation, and time travel.
In Distortions of Memory, experts in language, literature, neuroscience, philosophy, and psychoanalysis discuss what is known about how we store and subsequently recall the past.