Elizabeth Hannon is Director of the Forum, LSE, and the Assistant Editor for the British Journal for the Philosophy of Science. She has taught in Durham University, the University of Leeds, and the University of Cambridge. Her primary research interests lie within the philosophy of biology and she also edits the popular philosophy essay series, theEssays. Tim Lewens is a Professor of Philosophy of Science in the Department of History and Philosophy of Science, University of Cambridge, and a Fellow of Clare College. From 2014 to 2017 he was Deputy Director of the Centre for Research in Arts, Social Sciences and Humanities, University of Cambridge. His primary research interests include the philosophy of biology, biomedical ethics, and general philosophy of science. His publications include Darwin (Routledge 2007), Biological Foundations of Bioethics (OUP 2015), Cultural Evolution: Conceptual Challenges (OUP 2015), and The Meaning of Science (Penguin 2015). He was a member of the Nuffield Council on Bioethics from 2009 to 2015.