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Most of the digital texts submitted for review in California came from a nonprofit group, CK-12 Foundation, that develops free “flexbooks” that can be customized to meet state standards, and added to by teachers. Its physics flexbook, a Web-based, open-content compilation, was introduced in Virginia in March. “The good part of our flexbooks is that they can be anything you want,” said Neeru Khosla, a founder of the group. “You can use them online, you can download them onto a disk, you can print them, you can customize them, you can embed video. When people get over the mind-set issue, they’ll see that there’s no reason to pay $100 a pop for a textbook, when you can have the content you want free.”