In another huge step toward electronic textbooks with the look and feel of real books, scientists have created an ultra-thin screen that can be bent, twisted, and even rolled up and still display crisp text.

The material, only as thick as three human hairs, displays black text on a whitish-gray background with a resolution similar to that of a typical laptop computer screen.

The screen is so flexible it can be rolled into a cylinder about a half-inch wide without losing its image quality.

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