In the beginning, it was just about getting rid of the keys to his office.
American biohacker Amal Graafstra, 40, decided in 2005 that he wanted to be done with such archaic technology “from like 700 BC.” He looked at iris scanning and fingerprint reading as solutions for opening his office door, but decided those options were expensive and unreliable.
Inspired by the way pets are commonly tagged, he settled on a…