Matthew Sweet and guests discuss the impact of the shifting geo political and economic trends on the British class system with specialist guests.

Producer: Lisa Jenkinson

As Radio 4 marks the 5th anniversary of the first COVID lockdown, Free Thinking investigates one of the defining experiences of that period for many people: isolation. It's a word that entered the English language in the 18th century, and arguably its emergence as a concept marked a change in the way people saw their relationships with other people and the wider community, towards a more individualistic society. And yet there's a long history of religious mystics seeking solitude. From Robinson Crusoe to the crew of the International Space Station, via monasticism and Romanticism, Matthew Sweet investigates the histories of isolation and solitude.

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Producer: Luke Mulhall

Matthew Sweet and his guests discuss our shifting relationship with evidence from the law, to science, academic study and the paranormal. He's joined by Uncanny TV presenter Danny Robins, the former Supreme Court judge Lord Sumption and author of The Challenges of Democracy and the Rule of Law, Dr Sarah Dillon from the faculty of English at the University of Cambridge. Dr Jonathan Egid philosopher at SOAS in London and Dr Anthony Milligan a philosopher at Kings College London.

Producer: Lisa Jenkinson

Anne McElvoy and guests discuss the issue of uncertainty from scientific discovery and the space race to the shifting geopolitical landscape and how it can act as a catalyst for creativity. She's joined by the entrepreneur and author of Embracing Uncertainty, Margaret Heffernan, journalist and economist Liam Halligan, Astrophysicist Chris Lintott who also presents The Sky at Night, historian Timothy Garton Ash and Professor Victoria Donovan and author of Life in Spite of Everything: Tales from the Ukrainian East.

Producer: Lisa Jenkinson

Free Thinking looks at today's world with "a pinch of salt" tonight. From stories in the bible to desalination plants, preserving food to salt taxes: how does salt help us think about the past and present? We use phrases like "being worth your salt" or "dropping salt" meaning to spread rumours. With food writer Bee Wilson, materials scientist Mark Miodownik, the novelist and writer on folklore Zoe Gilbert and artist David Soin Tappeser. Plus, especially salty guest Baga Chipz.

David Soin Tappeser, along with Himali Singh Soin, is one half of Hylozoic/Desires, whose exhibition Salt Cosmologies is at Somerset House in London until the 27th April.

Producer: Luke Mulhall

Matthew Sweet and guests discuss changing course in life, flexible thinking and keeping an open mind with writer and curator Ekow Eshun, philosopher Sophie Grace Chappell, journalist Stephen Bush, author Timandra Harkness & philosopher Richard Bett

Producer: Lisa Jenkinson

From classical thinking to the romcom films in cinema today: Why do we yearn to find our "other half" but struggle with the reality of long term relationships? To discuss Rana Mitter is joined by:

Producer: Lisa Jenkinson

Matthew Sweet with art critic TJ Clark, who has written about the importance of repeated viewing for appreciating a work of art; philosopher and film historian Lucy Bolton, who's seen a re-issue of Chantel Akerman's film Jeanne Dielman, which documents the crushing routine of a Belgian housewife; philosopher and theologian Clare Carlisle, who has written on the philosopher Kierkegaard, who discussed repetition as a major feature structuring human life, and historian and educationalist Anthony Seldon. Plus composer, dramatist and regular silent film accompanist Neil Brand will be at the piano.

TJ Clark's new collection of Essays is called Those Passions: On Art and Politics.

Producer: Luke Mulhall

Matthew Sweet and guests talk about about the tools and processes of decision making today and through history.

Producer: Lisa Jenkinson

“A diary is not only a text: it is a behaviour, a way of life, of which the text is a by-product", says the French theorist Philipe Lejeune. From ancient Babylon to journalling today, politicians' jottings and the notes made by eighteenth century writers like Mary Hamilton and Fanny Burney. Matthew Sweet discusses diaries with curator Irving Finkel, literary historian Sophie Coulombeau, political commentator Michael Crick and writer Oliver Burkeman, whose latest book is Meditation For Mortals, plus the philosopher Maximillian De Gaynesford.