The truth is like a vegetable your mother makes you eat, nourishing but it tastes terrible
Sarah Dunant looks through history to understand apparently irrational behaviour.
Architectural writer Shumi Bose explores whether we can trust what we see.
Brian Cox, Robin Ince and guests ask whether science needs war to drive it.
Will Self asks some of Britain's key opinion-makers about the nature of our existence.
Edward Said considers how far an intellectual should participate in the public sphere.
Melvyn Bragg and his guests discuss the ancient Greek philosopher Heraclitus.
Edward Said explores the role of intellectuals from different cultures and backgrounds.
Dr Mark Lythgoe attempts to find out what constitutes intuition and when we should use it.
Could the world around us be a simulated reality?
Scientist Jim Al-Khalili gets a new pen-pal, living off-grid on a remote Canadian island.
Will Self expresses deep concerns about the nature and value of scientific progress.
Are we really living in a post-truth world? Jo Fidgen investigates.
Alan Read presents a philosophical reflection on reality and theatre.
Edward Said examines amateur intellectuals and their influence on society.
Melvyn Bragg examines whether mankind has made as much moral as material progress.
Joan Bakewell discusses belief with novelist Salley Vickers.
Marcus Brigstocke joins Brian Cox and Robin Ince to discuss the role of science mavericks.
Edward Said asks the basic question for the intellectual: how does one speak the truth?
Steven Poole argues that we should resist the idea that humans are irrational.
Robert Rowland Smith argues that we are coming to the end of the age of ideas.
Art critic Rachel Campbell-Johnston, explores the mysterious world of art attribution.
Michael Blastland examines the psychology of us and them and perceptions of 'the other'.
Josie Long hears stories of 'others' and outsiders.
Josie Long encounters strangers.
Ernie Rea and guests discuss the religious understanding of truth.
Melvyn Bragg and guests discuss philosophical approaches to truth.
Michael Howard, Tony Blair and Nicholas Parsons join Gerald to ask, 'What is truth?'.