Children in a Pennsylvania school follow recorded instructions as they do lessons in arithmetic while a teacher looks on. The recordings are part of an experimental teaching method called Individually Prescribed Instruction (IPI), which permits each pupil to progress at his or her own pace, PA, 1970. (Photo by United States Information Agency/RBM Vintage Images)

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Photo credit: © RBM Vintage Images / Alamy / Afripics
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Keywords: arithmetic, children, education, lessons, recordings, school, students, teacher, vintage, woman