For months, scientists and public officials have relied upon computer-based models to try to predict the trajectory or the coronavirus outbreak. But models are not crystal balls, and all of them involve human assumptions. Science correspondent Miles O’Brien reports on…

By Miles O'Brien

Testing, both for active cases of COVID-19 and for antibodies indicating prior exposure to the disease, will be critical to resuming economic activity. In addition, scientists are racing to develop therapies for people who do get infected -- especially those…