Imagine a classroom in the not-too-distant future. Textbooks, slideshows, and notes all interface neatly with devices that once called “phones” and “laptops”—but now those learning materials proliferate through desks, walls, clothes, jewelry, glasses, and maybe even tattooes or contact lenses. The teacher, trained to teach in the 2010s, wants to say, “close your laptops and put away your phones.” But when the phone is embedded in a fingernail, what can a teacher do?

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