A federal judge struck down the CDC's mask mandate for public transportation on Monday, clearing the way for airlines and ride hailing companies to eliminate mask requirements for passengers. What might the change mean for travelers — especially those most vulnerable to infection or too young to be vaccinated? NPR science correspondents Selena Simmons-Duffin and Maria Godoy explain. NPR's Tamara Keith outlines the political implications for the Biden administration. In participating regions, you'll also hear a local news segment to help you make sense of what's going on in your community.Email us at considerthis@npr.org.