22:15The Reith LecturesMargaret MacMillan - The Mark of CainWar and HumanityBBC Radio 4 Duration: 45 minutes Sat 30th Jun 2018, 22:15 on BBC Radio 4 FMAvailable for over a yearListen nowHistorian Margaret MacMillan asks if war an essential part of being human. Show more GenresFactualArts, Culture & the MediaBrandThe Reith LecturesSeriesThe Reith Lectures: Margaret MacMillan - The Mark of Cain Source: BBC Online