Exchanges at the Frontier

What – if anything - does science owe to society?

For a second season, the philosopher AC Grayling meets the scientists at the cutting edge of a fast-changing world.

In a series of public events from BBC World Service with the Wellcome Collection, Exchanges at The Frontier sees the world's leading scientists tested over the impact of their work by the philosopher and public intellectual AC Grayling.

For 2010, meet the world's leading authorities in the fields of ageing, malaria, string theory, psychotic behaviour and Alzheimer's disease.