Andrew Marr looks at how a remarkable group of philosophers and scientists in 18th-century Edinburgh challenged convention and laid the foundations for the modern world.

At the heart of what has come to be known as the Scottish Enlightenment was the philosopher, historian and economist David Hume, with his revolutionary investigations into the nature of knowledge. Hume attracted thinkers including Lord Kames and Adam Smith, and their convivial discussions led to works that explored the nature of the world in a spirit of rational enquiry.

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