G. E. R. Lloyd is Emeritus Professor of Ancient Philosophy and Science at the University of Cambridge, Former Master of Darwin College, Cambridge, and Senior Scholar in Residence at the Needham Research Institute, Cambridge. He is the author of twenty-two books and editor of four, and was knighted for 'services to the history of thought' in 1997. Jingyi Jenny Zhao is Lloyd-Dan David Research Fellow at the Needham Research Institute and at Darwin College, Cambridge. Qiaosheng Dong is currently affiliated to the Cambridge Peking University China Centre at Jesus College.