In a big leap into a new but adjacent market, Silicon Valley digital education start-up Kno said it is entering the K-12 space, expanding from its college-only focus, All Things D reports. Its first step will be a partnership with major textbook publisher Houghton Mifflin Harcourt, which provides nearly half of such content aimed at children from kindergarten through high school. Enhanced digital versions of those textbooks cost $9.99 or
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