A woman's incredible nose might help scientists detect Parkinson's earlier than ever.

Joy Milne says she was living in Perth, Scotland, with her husband Les, when she noticed that he smelled different. Milne would later describe to the BBC as a kind of heavy, musky smell. The change was subtle, but it was there none-the-less. Milne says that at the time, she nagged Les a bit about missing showers, but didn't think much more of it.

Six years later, Les was diagnosed with Parkinson's disease, a neurodegenerative disease that attacks brain cells, causing tremors and other mobility issues. In the United States, about one million Americans live with the disease. There are therapies that can help with the symptoms, but no cure.

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