Dr. Lucky Tran 
“A team of researchers at Washington University has developed an air monitor that can alert users to the presence of SARS-CoV-2 — the virus responsible for #COVID-19 — in just five minutes.”
Much work to do, but this would be a gamechanger!
jwz@luckytran I feel like this would just give us something like those maps of "most dangerous intersections for bicyclists", where the entire map is red. It's only a game changer if literally anyone had the political will to do anything about it.