Why do we clap? Becky Milligan uncovers how the highly contagious nature of applause has been exploited by everyone from Roman emperors to today's politicians . She explores the different styles and rhythms. And how it can make us feel on top of the world or make us want to crawl under a stone.

With Historian Greg Aldrete, theatre critic Anne Treneman, music academic Dr Marcus Pearce, Mathematician Richard Mann, comedian Mark Cooper-Jones and former Women's Institute Chairman Helen Carey.

(Photo: A pair of hands clapping on black background. Credit:BravissimoS/Shutterstock)