Free Thinking - Margaret Atwood, Yuval Harari, Celts

Margaret Atwood's new novel imagines the future of sexual desire in a social experiment. Professors Yuval Harari and Barry Cunliffe explore the long history of mankind. And Rana Mitter visits the new exhibition about Celts at the British Museum and discusses it with historian and author Dr Janina Ramirez and Professor Barry Cunliffe.