International travel is a mind-expanding privilege — but it is also immensely painful — mainly because of how dependent we are on paperwork. Have the wrong piece of paper, or the wrong credentials on a piece of paper, and a routine process can become a nightmare.

When paper tickets gave way to e-tickets more than a decade ago, it was easy to imagine that all travel would eventually become digital. Printed boarding passes were next to go, further convincing us that the future was nigh...

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