Histories spanning the Big Bang to the present, and the story of an entire continent have been written by two of the Free Thinking guests tonight. What insights do big histories bring and what is the value of focusing on a single family or object ? And how do these approaches apply when looking at policy and government. Matthew Sweet's guests are:

Professor Peter Frankopan has written New Silk Roads and The Earth Transformed: An Untold HistoryAlison Light's most recent book of essays is called – Inside History: From Popular Fiction to Life-Writing, previous titles include Common People: The History of an English FamilyZeinab Badawi is author of An African History of Africa. The first presenter of the ITV Morning News and co-presenter of Channel 4 News, she is president of SOAS University of London.Bronwen Maddox is CEO of Chatham House and a Visiting Professor in the Policy Institute at King's College London. She's been Director of the Institute for Government and editor and chief executive of the magazine Prospect.BBC Moscow Correspondent Steve Rosenberg

Producer: Lisa Jenkinson.