Robotics is the study of robots. Robots are machines that can be used to do jobs. Some robots can do work by themselves. Other robots must always have a person telling them what to do.
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Ethical? No, because they take jobs away from family that may need money.
Bibliography, Paul Rybski, Manuela Veloso. CMRoboBits: Creating an Intelligent AIBO robot Search on Google Scholar
in AI Magazine 27(1), 2006.