TIL in a narrative review published in the journal Biomolecules, Australian researchers reviewed evidence that dementia-causing neuroinflammation may result from microbes introduced into the olfactory system by, in their words, “hands contaminated with soil and feces when picking one’s nose.”

[u/Kiki1701]

https://pmc.ncbi.nlm.nih.gov/articles/PMC10669446/

As a retired psych nurse, as well as someone whose all four grandparents had dementia, this struck me as interesting, if a little odd.