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a robot arm capable of doing the dishes is also capable enough to manipulate a knife (commonly found in kitchens) in a stabbing motion. Not intentionally, of course, but the sci-fi story of this going bad writes itself. That doesn't mean we shouldn't do it, I'll be the first in line to buy a robot arm sink dishwasher, but robotics is dangerous, even when not piloting a several ton vehicle down the road.