Cosmologist Martin Rees, a pioneer of multiverse concept, is one of the most productive and respected thinkers about the origins and development of the universe. A former president of the Royal Society, he is also famous for his wise and thoughtful commentary on the state of science, and his thinking about the future. In this interview, he ranges widely over many themes, including the question of whether the pursuit of fundamental physics will one day run out of steam, become too expensive and perhaps too difficult to pursue. This is one of a series of interviews given by world-class experts to Graham on the themes he explores in his new book The Universe Speaks in Numbers. For information regarding your data privacy, visit acast.com/privacy