Here's why we don't have robot butlers yet

In the realm of robotics, there's a classic story about an engineering professor who on the first day of class assigns her freshman students to invent a robot that washes dishes and draw a back-of-the-envelope sketch of it. Invariably, many of the students come in the next day with drawings of robot arms or even full C-3PO style androids doing dishes at a sink. — Read the rest

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