Jonathan delves into "A Catalogue of Previous Universes" this week on WireTap. Ever wondered if there were other universes before ours? This week's Wiretap explores the whimsical worlds created as test runs for our own. Atlantis? Lilliput? Oz? Travel an imaginary world on WireTap, with Jonathan Goldstein, Sunday afternoon at 1 (1:30 NT, 4 PT) on CBC Radio One.