I wore one on my last hike -- and in fact, the hiking trail was the most crowded...

kube-system on Nov 23, 2020 | parent | context | favorite | on: SARS-CoV-2 concentrations and virus-laden aerosol ...

I wore one on my last hike -- and in fact, the hiking trail was the most crowded place I've been in months. Parks all over the US have seen record-breaking attendance figures this year.