Dwarf planets and cooperating rats

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Pluto demoted again? It's been some fall from grace for Pluto. This week sees a possible new definition of dwarf-planet, and it seems Pluto is hardly special at all. interview by Marc West
Ian Woolf tackles grey hair and baldness, and rats solving the long-standing mathematical conundrum, the prisoners' dilemma.
Produced and presented by Victoria Bond

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