The Russian-born writer whose influence is most evident in her adopted home of the USA.
Neuropsychologist Paul Broks looks at the idea of leading a good life by being selfish.
Alan Dein explores Karl Marx's journey from corpse to bronze monolith.
Irish comic Dave Allen is chosen by actor and comedian Adil Ray. Matthew Parris presents.
Derren Brown gets inside the mind of musical wizard and fellow sceptic Tim Minchin.
For Stalin, privacy was key. So how would he feel about his secrets being revealed?
Cartoonist Ralph Steadman and translator Adam Czerniawski discuss the philosopher's life.
Tom Service finds out about the music composed by philosopher Friedrich Nietszche.
The life and ideas of Karl Marx who changed the world with his Communist Manifesto.
Melvyn Bragg and guests discuss Nietzsche's On The Genealogy of Morality.
The life and work of French novelist, playwright and philosopher Jean-Paul Sartre.
The love affair between Jean-Paul Sartre and Simone de Beauvoir lasted for 50 years.
Michael Maloney reads an extract from Florian Illies's 1913.
Alistair Cooke examines tyrants who commit mass murder and compares Stalin with Hitler.
Comedian and musician Tim Minchin interviews journalist and author Caitlin Moran.
Writer AL Kennedy explores existentialist ideas about the individual.