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This is one of our podcasts from Stephen Hawking's 70th birthday conference, which took place in January 2012 in Cambridge. Rachel Thomas talks to Renata Kallosh from Stanford University about a theory that promises to unite the physics of the very small — quantum physics — and the physics of the very large — Einstein's theory of gravity. It's called N=8 supergravity. The podcast accompanies the article Supergravity to the rescue?, which contains more information on the concepts that are being discussed.