Almost two years into the pandemic, at-home rapid tests can still be difficult to find in the U.S. If you do find them, they're often expensive. Other countries are faring better, like the U.K. and South Korea, which provide free tests each day to anyone who wants them. Why is the U.S. different? NPR's Yuki Noguchi reports. 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.