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Your sense of smell can be a powerful thing, but imagine if you could smell a developing disease? Joy Milne, noticed her husband\u2019s scent changed when he was 33. It turned out, she was smelling his Parkinson\u2019s more than a decade before his diagnosis. \n\nShe has been working with researchers ever since, and now they\u2019ve developed a skin test that would identify the disease before symptoms begin. Joy joined Sean on the show today...