Epigenetic biomarkers of exposure and aging DNA methylation signatures and epigenetic clocks that capture how exposures become biologically embedded Air pollution and Parkinson's disease How air pollution, genes, and metabolism combine to shape Parkinson's disease Tools for measuring biological aging Open-source software that makes biological age measurable across cohorts Diet, the gut microbiome, and Parkinson's disease How diet shapes the gut microbiome in Parkinson's disease