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Image: Scientists have found a way to store an entire textbook in the code of DNA.
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Users can pay for just a chapter of a book or buy an entire textbook through the app.
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Users don't have to buy the entire textbook: They can just buy a few chapters and later get the entire textbook.
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They may not read an entire textbook or research report, but could readily use e-books to search multiple books, take notes or highlight text.
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(I consider here only the evolution chapters of comprehensive biology texts for introductory courses, not entire textbooks on evolution.