Science and Innovation

Brady Smith, U.S. Forest Service, Southwestern Region, Coconino National Forest

A memo published today by Secretary of Agriculture Sonny Perdue directs the U.S. Forest Service to increase mining, grazing, and recreation on public lands. KNAU’s Melissa Sevigny reports.

Cases of the coronavirus disease continue to rise in Arizona and the country. New research shows just a small fraction of sick individuals might be responsible for the majority of new cases. In KNAU’s weekly update on the science of COVID-19, Melissa Sevigny speaks with infectious disease expert Dr. Paul Keim about these so-called “super-spreader events” and what they mean for controlling the pandemic.


The coronavirus that causes COVID-19 is starting to evolve. Scientists say that’s nothing to be alarmed about, but it does have implications for public health. In KNAU’s weekly update on the science of COVID-19, Melissa Sevigny spoke with Dr. Jason Ladner, a geneticist at Northern Arizona University, about why viruses change over time and what that could mean for developing a vaccine.  

Kris Hanning/U of A Health Sciences

The University of Arizona is unrolling a statewide program to test 250,000 health care workers and first responders in Arizona for antibodies against COVID-19. KNAU’s Melissa Sevigny reports.


Scientists use different models to try to forecast the spread of the coronavirus disease. The models can inform public health decisions like when to reopen businesses, but—just like weather forecasting—they’re not perfect at predicting the future. KNAU’s Melissa Sevigny spoke with computer modeler Joe Mihaljevic of Northern Arizona University for our weekly update on the science of COVID-19.