This is a lovely idea. "Students point their phone's camera at a textbook page or piece of homework, and instantly see resources about key facts and tricky parts, prerequisites, and links to snippets of online classes or study guides that could help." The application is called Volley and it earned 3.2 million in seed money to develop and commercialize the app (it doesn't appear to actually exist yet; it "is now in private alpha that you can sign up for here. But it's planning more tools to aid students, teachers, and school systems." ).
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