How little we know about what our ancestors really ate for dinner, with Richard Wrangham (0:00). How the field of neuroscience has changed over the past 25 years, with Eric Kandel (8:17). How countries are working to shape economic and social policies on biotechnology, even as the field is rapidly growing, with Jim Philp (15:15). Plus, sample a selection of the hottest new papers from Cell Press (21:43).