If one thing is clear about this teeny tiny new coronavirus, it’s that it has changed the world. Scientists around the world are trying to understand how immunity to the coronavirus works — but, as The World’s Elana Gordon reports, it’s a maddening puzzle. English pubs are reopening this weekend. Prime Minister Boris Johnson is encouraging the British public to enjoy, but also to use good judgment. Also, how the pandemic is getting people to rethink the ways they work. One municipality in Nova Scotia experiments with a four-day work week. Plus, a new album from the Djibouti national radio band is the first global album release in the country’s 43-year history. The World’s host Marco Werman speaks to one of the co-producers of the album, called “The Dancing Devils of Djibouti.”