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Health workers wait for volunteers to make screening for the coronavirus to see if they can join a pool of around 500 people allowed into a concert in Barcelona, Spain, Saturday, Dec. 12, 2020. Five hundred music fans eager for a live show without social distancing are volunteering to test the effectiveness of same-day coronavirus screening at a concert in Barcelona. The concert goers must pass an antigen test before entering the concert. Face masks and hand hygiene are musts inside the show. (AP Photo/Emilio Morenatti)