When I asked other panelists about augmenting healthy body parts over lunch that day, most seemed a little exasperated. At one point, I mentioned that I had a finger magnet to Michael Chorost, who got a groundbreaking cochlear implant to restore his hearing. "Don't get a magnet," he sighed, apparently not realizing that I wasn't speaking hypothetically.
The better wearable devices get, the less sense it makes to permanently modify your body. Things like exoskeletons, smart glasses, and external brain-computer interfaces are safer and much easier to upgrade than their implanted counterparts. Plus, you can take them off in inappropriate situations: you won't get stuck trying to swim with a metal limb, for example, or wearing a permanent version of Google Glass to a laid-back dive bar.
I realized that my sixth sense was failing when I stopped noticing the magnetic fields of my laptop.