Terrific 1968 explainer movie about lasers

Back in 4th grade, I broke my leg skiing and spent the rest of the school year unable to participate in gym class, and so was sent to the library instead, where I discovered the Audio/Visual lab. I watched hundreds of these educational films (gym was an everyday hour long class), including this one, and between the films, free reign in reading anything in the library I wanted to, and having completed the year’s classwork while bed-bound, I got a very good if eclectic education that year. I was quite disappointed when the doctor said I couldn’t skip gym any more for the next term.

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