I was researching magnesium and neurological disease when I came across this recently published study. There's nothing here to improve our lot, BUT I just thought it slightly funny to think the dirt in my back yard may be helping or hurting my condition. The study I linked below found a correlation between soil content of selenium, strontium, and magnesium and PD:
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Association of soil selenium, strontium, and magnesium concentrations with Parkinson's disease mortality rates in the USA.
ncbi.nlm.nih.gov/pubmed/281...
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Funny And interesting!