10:32DiscoveryExchanges At The FrontierEpisode 4 - Jim VirdeeBBC World Service Duration: 27 minutes Wed 23rd Dec 2009, 10:32 on BBC World Service OnlineAvailable for over a yearListen nowLeading scientists are tested over the social impact of their discoveries by philosopher Anthony Grayling and the public.GenresFactualScience & NatureFormatsDiscussion & TalkBrandDiscoverySeriesDiscovery: Exchanges At The Frontier Source: BBC Online