Overhead projectors: Turn around

For decades, practically every classroom in the United States had one thing in common: a big, bright overhead projector at the front of the class. How it got there is a story that takes hundreds of years, and a war or two, to explain. David Pierce is joined by The Verge’s Jake Kastrenakes and Stanford professor Antero Garcia to learn about where projectors came from, how they took over education, and why they eventually faded out.

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