The end of humanity isn’t going to come as a result of military robots taking it into their silicon heads to wipe us all out. It’s going to be the result of domestic robots doing that very thing. At least, that’s how the science fiction goes. And seeing Digit, the creation of Ford and a robotics startup called Agility Robotics, hasn’t really assured us that things will go otherwise. But that’s mostly because we can see this bipedal critter being really useful.