Most Advanced Electronic Ink Display: Kindle's high-contrast electronic ink display delivers clear, crisp text and images.

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"With clear illustrations, practical experiments, and well-paced text, it makes an interest in science look like fun, " she said.

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The paper-like E Ink display features crisp, clear text that's great for reading anywhere, even in bright sunlight.

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To be sure, U.S. law-enforcement officials say it isn't clear whether knowing the content of the text messages would have changed what the FBI learned in 2011 about Mr. Tsarnaev's turn toward radicalization.

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There's a mount on the side for the all important stylus, and the screen itself -- wile utilitarian in nature -- is easy to look at, and text, words and drawings appear clear.

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