There's a hand lying on the blanket on Matt Nagle's desk and he's staring at it intently, thinking "Close, close," as the scientists gathered around him look on. To their delight, the hand twitches and its outstretched fingers close around the open palm, clenching to a fist.
In that moment, Nagle made history. Paralysed from the neck down after a vicious knife attack four years ago, he is the first person to have controlled an artificial limb using a device chronically implanted into his brain.
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