Born with a rare hereditary condition called hyperosmia, Joy Milne possesses a superhuman sense of smell—one so acute it led her to make a groundbreaking medical discovery: Parkinson's Disease has a smell.

How did she do it? What might it mean for the future of diagnostic testing? And what other diseases and human conditions have scents?

(SPOILER ALERT: romantic compatibility is one of them!)

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SOTD: Maison D'Etto Noisette