Textbooks can be a drag. Literally. They've been weighing down backpacks for years. While the ability to be free of them has been around for a long time, the idea is just starting to gain traction. A few years back, Kno unveiled a textbook-sized tablet device with dual screens. The tablet itself didn't take off but company co-founder Osman Rashid went on to found Chegg, an e-textbook company that gets textbooks on all sorts of tablets, including the iPad and Android devices. Chegg customers can rent or buy textbooks and access them with a Web browser.
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