Gripping a scalpel, Vladislav Zaitsev makes an incision in the fold of skin between his client's thumb and index finger and pushes in a small glass cylinder.

Alexei Rautkin, a programmer in a hoodie, is having a chip inserted in his hand so he can open the door to his office without swiping a card. "It's something I decided a long time ago," he says. "Mainly because it's convenient but there's also a kind of exclusivity, because practically no-one else has this."

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