Prison gangs in the USA. Laurie Taylor talks to David Skarbek, Lecturer in the Department of Political Economy at King's College, London, about his research into the hidden world of convict culture, inmate hierarchy and jail politics. He finds sophisticated organisations, often with written constitutions, behind the popular image of chaotic violence. They're joined by Jane Wood, Senior Lecturer in Forensic Psychology at the University of Kent.

Also, what would children do with an unexpected windfall of a million pounds? Sally Power, Professor of Education at Cardiff University, asked this question in order to explore children's values and priorities. Would they spend, save or give it away?

Producer: Jayne Egerton.