Is my robot happy to see me?

People are social creatures. Robots... not so much. When we think of robots, we think of cold, metallic computers without emotion. If science fiction has taught us anything, though, it's that we crave emotion, even in our robots - think C-3PO or Star Trek's Data. So it stands to reason that if robots are ever going to become a fixture in our society, even becoming integrated into our households, we need to be able to read their faces. But how good are we at reading robot faces?...

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