When I first heard about this years ago, I knew exactly what the scent was, because I'd noticed it on my grandfather years before. I don't think I have a particularly great sense of smell - in fact, from a childhood of secondhand smoke and oddly narrow sinus passages / allergies, I've always felt like my nose didn't really work. But, the smell of people with Parkinson's is very distinct and I've noticed it on people since. Likewise, the last time I was at my grandmother's house, I noticed very distinctly that the smell was no longer there as it was one of the few times I'd been back at her house since grandpa passed away. Parkinsons / Lewy body / Althzeimers are all fascinating yet horrifying for what they do to people and I'm thankful there are people researching and seeking remedies.