nprnews_____ = ||| lubuntu at wor3 89S7|||For Scientists Who Study Virus Transmission, 2020 Was A Watershed Year||| kickerpage = |||no kicker pagenpr for NPRNEWS||| summarynpr = |||The emergence of COVID-19 started scientists on a year-long, crash course to learn how this virus might travel through the air and how to stop it. They learned a lot, and quickly.