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Philip Ball tells the tale of Robert Grosseteste and his medieval Big Bang Theory. This is the story of how a 13th Century Bishop, obsessed with rainbows, colour and light streaming through Cathedral windows, describes the birth of the cosmos in his treatise 'On Light'. It's a tale of daring invention and imagination, of how an early faith in scientific and mathematical principles, coupled to a belief in a universe ordered by God, gave rise to an uncannily prescient idea. It was nothing less than a medieval Big Bang.

Producer: Erika Wright.