It’s not enough that the rectangular screens we care about so much have our passwords, passcodes, unlock patterns, fingerprints, digital signatures and keys, our faces, our voices – no, they demand our hearts, too! I’m joking, of course: they have been monitoring our cardiovascular activity via various smartwatches and fitness trackers for years now. The thing is that soon (allegedly), we’ll be able to unlock our iPhones with our… heart rhythm.
