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Paul Broks looks at the philosopher Ludwig Wittgenstein and the problem of 'other minds'.

Clare Carlisle grapples with Bishop Berkley's idea that objects only exist in our minds.

How can we separate real science from mumbo jumbo? Physicist Tara Shears investigates.

Barrister Harry Potter on whether we can believe our eyes.

Melvyn Bragg and guests discuss how we can know anything at all.

How should we love our children? Philosopher Jean-Jacques Rousseau had some great ideas.

What is love? Psychotherapist Mark Vernon looks at Freud's ideas on the Greek god Eros.

Giles Fraser discusses gene theory versus altruism with Tom Stoppard and Armand Leroi.

Classicist Edith Hall on Aristophanes's explanation of love.

Melvyn Bragg and guests discuss the history of ideas around love.

Timothy Secret on Confucius. To live well together we must first consider the dead.

Angie Hobbs asks if the ideal state would be run by philosophers not politicians.

Is a free market the best foundation for a fair, dynamic society?

Professor Justin Champion examines Locke's Letter on Toleration.

Melvyn Bragg and guests debate how we should live together.

Philosopher Barry Smith explores ideas about consciousness.

Jules Evans explores Jung and the shadow inside all of us.

Writer AL Kennedy explores existentialist ideas about the individual.

Paul Broks asks how we can be sure we are the same person that we were yesterday.

Barry Smith, Paul Broks, AL Kennedy and Jules Evans discuss the self.

Historian Alice Taylor on the slippery justice of extrajudicial detention.

Criminologist David Wilson looks at Thomas Hobbes and his 'social contract' theory.

Angie Hobbs, Leif Wenar and David Runciman debate and explore the ideas of John Rawls.

In this edition of a series of programmes on justice, Harry Potter examines deterrence.

Melvyn Bragg and guests discuss ideas about justice.

Neuropsychologist Paul Broks looks at the idea of leading a good life by being selfish.

Naomi Appleton explores the Buddha's Four Noble Truths.

Justin Champion looks at the roots of our culture's belief in the moral power of hard work

Philosopher Jules Evans asks Gus O'Donnell how to measure the good life.

Melvyn Bragg and guests discuss how to live a good life.