Neil deGrasse Tyson hosts the TV program NOVA ScienceNOW, and gives wonderfully amusing and insightful talks, some of which are on YouTube. Brian Greene did a PBS program about string theory, called The Elegant Universe, based on his book of the same name. Both scientists have a way of making science interesting and understandable to the general public, and both are excellent, charismatic speakers. If you have a chance to see or hear either of them, do it.
A week ago, or so, Dr Greene was on the radio program Fresh Air, a 34-minute segment called
A Physicist Explains Why Parallel Universes May Exist (promoting his new book, of course, The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos). Go give it a listen.