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The solar cell idea is a good one... especially if you could either put one on the outside and inside cover, or somehow incorporate a clear solar cell into the screen.
Regarding color, no, it's not needed for reading per se. However, as we've noted elsewhere in these forums, color screens would make it feasible to import textbooks and magazines into the readers, making them more useful and popular to the general public, and thereby (hopefully) kicking off their widespread usage. Many of us believe that color may be the one thing holding readers back.
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