Contributor(s): Professor James Ladyman, Professor Martha Nussbaum, Lord Rees of Ludlow, Richard Smith | James Ladyman is Professor of Philosophy at the University of Bristol and co-editor of the British Journal of the Philosophy of Science. Martha Nussbaum is Ernst Freund Distinguished Service Professor of Law and Ethics at the University of Chicago. Lord Rees of Ludlow is President of the Royal Society, Astronomer Royal and Master of Trinity College Cambridge. Richard Smith is a Former editor of the British Medical Journal and Director of the Ovations Institute. Mark Lawson from BBC Radio 4 and The Guardian.