Matthew Sweet speaks to acclaimed director Michael Grandage whose theatre company launches with a new production of Peter Nichols's celebrated play Privates on Parade. As a new centre in Cambridge is set up to assess the dangers that might arise from progress in artificial intelligence, Matthew talks to one of its founders Sir Martin Rees and sustainability innovator Rachel Armstrong. And Jonas Mekas, film-maker, artist, poet, and a leading figure of avant-garde and experimental cinema, discusses his remarkable and prolific sixty-year career.