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The Story of Science – What Is the World Made of (BBC Documentary)

Michael Mosley tries out a bizarre experiment using human urine, first performed by a seventeenth-century alchemist called Hennig Brand. Searching for the philosophers stone a substance with the power to transform base metals into gold Brand began by boiling down gallons of urine. With help from Dr Andrea Sella, Michael repeats Brands experiment, and finds something almost as magical: the element phosphorus.