News How a 1960s discovery in Yellowstone made millions of COVID-19 PCR tests possible February 21, 2021February 21, 2021Devi Shastri, Milwaukee Journal SentinelComments Off on How a 1960s discovery in Yellowstone made millions of COVID-19 PCR tests possible The science behind COVID-19 PCR tests can be traced back to two microbiologists' discovery in the hot springs of Yellowstone National Park.