Significant international thinkers deliver the BBC's flagship annual lecture series
Musician and conductor Daniel Barenboim examines the physical phenomenon of sound.
Niall Ferguson reflects on the causes and lessons of the global financial crisis.
Chris Patten examines how governance affects sustainable development.
Prof Michael Sandel considers the expansion and moral limits of markets.
Aung San Suu Kyi explores what freedom means in the first of the 2011 Reith Lectures.
Neurobiologist Colin Blakemore explores the historic concepts of the brain.
Professor Robert Oppenheimer explains how human communities resemble atoms.
Spence reflects on China's most enduring thinker, Confucius.
In the inaugural Reith lecture, Bertrand Russell examines the impulses in human nature.