The famous saying "I think, therefore I am" was the cornerstone of the philosophy of Rene Descartes, who died 375 years ago this month at the age of 53. His groundbreaking ideas shaped Western thought and continue to influence our understanding of existence, knowledge and the nature of reality. Descartes' ground-breaking approach involved questioning all beliefs to determine those which are absolutely certain. Professor Suzannah Lipscomb is joined by Professor Catherine Wilson to discuss Descartes' ideas and how they continue to resonate in modern philosophy, science and even popular culture.

Presented by Professor Suzannah Lipscomb. The researcher is Alice Smith, audio editor is Amy Haddow and the producer is Rob Weinberg. The senior producer is Anne-Marie Luff.

Theme music from All3Media. Other music courtesy of Epidemic Sounds.

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