Monica Chin writes: “Catherine Garland, an astrophysicist, started seeing the problem in 2017. She’d laid out the assignment clearly, but student after student was calling her over for help. They were all getting the same error message: The program couldn’t find their files. Gradually, Garland came to the same realization that many of her fellow educators have reached in the past four years: The concept of file folders and directories, essential to previous generations’ understanding of computers, is gibberish to many modern students.”