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You've heard the rumblings of the robots, right? When I make a customer service call and get an eerily nuanced answer from a chatbot, I hear the rumbling of the robots. When I call out to my digital assistant and Siri/Alexa/Cortana makes a wise-cracking response, I feel the rumblings. I can't help but love my Roomba, and I have mixed feelings about the robot that assembled my car, but what about the more nebulous forms of Artificial Intelligence? Up to 50 percent of the human workforce may be replaced by machines, a 2013 Oxford study predicts, and McKinsey estimates that 60 percent of all jobs have least 30 percent of activities "that are technically automatable, based on technologies available today."