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Niche Biz: Free Textbooks

MIT Technology Review: Ask Ariel Diaz why he’s taking on the college textbook industry and he’ll tell you, “Quaternions.” Quaternions are a number system used for calculating three-dimensional motion, popular in computer graphics. And Diaz needed a crash course to help him with a consulting gig after his online video platform startup, Youcastr, had failed. […]

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