March 11 will mark one year since the World Health Organization officially declared the coronavirus outbreak a global pandemic — when schools, businesses and workplaces began shutting down. To mark the moment, two of the nation's top public health officials who have helped lead the U.S. response to the pandemic — Dr. Anthony Fauci and Dr. Francis Collins — spoke to NPR about what they've learned, what they regret and why they're hopeful about the year ahead. Hear their full interview with NPR's Mary Louise Kelly.Collins is the Director of the National Institutes of Health and Fauci is the chief medical adviser to President Biden. And NPR's Brianna Scott reports on how some Americans remember March 11. In participating regions, you'll also hear a local news segment that will help you make sense of what's going on in your community.Email us at considerthis@npr.org.