Professor Sandy Pentland is the modern pioneer of what’s called ‘Social Physics’ - the analysis of human interactions using so called Big Data. Mining data - from credit cards, electronic ticketing and mobile phones - we can now take a reading of the city, its pulse. Sandy Pentland tells us why some cities are richer and more successful than others.

Presented by David Edmonds

(Image: Busy city scene at night, Credit: Getty Images)