What computer-based models can tell us about coronavirus -- and what they can't

Ensemble modeling, meaning combining the predictions of many different models, it's a crucial tool that has greatly improved forecasting the weather and, in the past three years, seasonal influenza as well. Nick Reich is an associate professor of biostatistics at the University of Massachusetts-Amherst. Working with the Centers for Disease Control and Prevention, he leads a team that builds ensemble models to improve predictions of the spread of the flu.