Melvyn Bragg and guests discuss how we can know anything at all.
Barrister Harry Potter on whether we can believe our eyes.
Popular history series.
History as told by the people who were there.
How can we separate real science from mumbo jumbo? Physicist Tara Shears investigates.
Clare Carlisle grapples with Bishop Berkley's idea that objects only exist in our minds.
Paul Broks looks at the philosopher Ludwig Wittgenstein and the problem of 'other minds'.