Where do you find crazy ideas and some of the world's smartest people? In theoretical physics - the world of parallel universes, super strings and black holes. We go on a whirlwind tour of the universe - from the multiverse to an imaginary walk on Mars. Mathematical Universe - Max Tegmark; Copernicus - Dava Sobel; Neil DeGrasse Tyson's Cosmic Wonder; Walking on Mars - Craig Childs; Steven Weinberg's Dangerous Idea; Sean Carroll's Very Big Picture.
