Our world is populated by hundreds of thousands of cyborgs. Some are Parkinson’s patients, who can shut off their tremors by activating metal electrodes implanted deep within their brains. Others—albeit far fewer—are completely paralyzed people who can move robotic limbs with their minds, thanks to their own implants. Such technologies can radically improve someone’s quality of life. But they have a major problem: Metal and the brain get along very, very poorly.
Brains have the texture of Jell-O—push on them too hard, and they’ll come apart into fragile clumps. There’s a violence to probing the brain with wires. “It’s like sticking a knife into the tissue,” says Magnus Berggren, professor
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