Edward Chang keeps a cybernetic implant at his desk, which seems almost calculatedly cool. Chang is a lean, low-voiced neurosurgeon at UC San Francisco. The cybernetic implant—more properly a Brain-Computer Interface—is a floppy, translucent plastic square about the size of my hand, embedded with a 16-by-16 array of titanium dots, each about the size of a cupcake sprinkle. This part sits on top of a brain.

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