Multiverses, the Big Bang and laws of physics

Physicist and science populariser Paul Davies talks to Naked Astronomy's Ben McAllister about some of the toughest questions cosmologist are grappling with: how did the Universe begin and how will it end, what provoked the Big Bang, and are we part of a "Multiverse"? The duo also take in Dark Matter, extraterrestrial beings, consciousness, free will and whether it exists, and the origins of life itself...