To kick off our new series on revolutionary ideas past, present and future David talks to two regular PPF contributors – the philosopher Lea Ypi and the scientist Adam Rutherford – about what makes an idea truly revolutionary. Do revolutionary ideas change the world? Can the world be changed without them? Can bad ideas ever be revolutionary ideas? And where should we be looking for revolutionary ideas today?

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Next Time: The History of Revolutionary Ideas: Socrates w/Agnes Callard

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