Is there a maximum number of friendships that we can maintain? Does this number apply universally? Robin Dunbar believes there are discoverable patterns in the numbers of close and less close relationships human beings can cope with and that this is reflected in, for example, the structural units of armies. In this episode of the Social Science Bites podcast he discusses this phenomenon with Nigel Warburton. A verbatim transcript of this interview is available from www.socialsciencespace.com