caption: <PERSON> stows packages into special containers after robots deliver separated packages by zip code at an Amazon warehouse facility in Goodyear, Ariz. Doing your job side-by-side with robots isn't easy. According to their makers, the machines should take on the most mundane and physically strenuous tasks. In reality, they're also creating new forms of stress and strain in the form of injuries and just the unease of working in close quarters with mobile half-ton devices that direct themselves. (AP Photo / <PERSON>)
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