How the overhead projector transformed classrooms and how students learn

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Overhead projectors, first used largely for military purposes, eventually made their way into schools and changed classroom teaching. The Verge's latest Version History episode traces how the devices were developed. Host David Pierce is joined by Jake Kastrenakes of The Verge and Stanford professor Antero Garcia for the discussion. The conversation covers how the projectors reached classrooms and how they altered students' learning experiences.

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