Time is the 4th dimension. A movement, flow, change, that we all know, but cannot put into words. In physics, the laws of nature are commonly considered to be timeless; unchanging. But if they are changeless, then where did they come from? On this week’s show, Philip Mereton talks about time and the evolving laws of nature with one of the world’s leading theoretical physicists, Lee Smolin, author of the new book, Time Reborn: From the Crisis in Physics to the Future of the Universe,