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The international-travel ritual I would very much like to have done for the last time

Staying up past midnight isn’t really part of my event routine these days, but I was determined to do that Tuesday night in Barcelona–not to enjoy any MWC nightlife, but so I could swirl a swab in each of nostrils while a stranger watched me do that via my phone’s camera. I timed this quasi-exhibitionist performance to meet the Centers for Disease Control’s rule that air travelers to the United…