Why does everyone love the small, chiming robot R2-D2 in Star Wars? It might just be because of his agreeable little chirps. Scientists studying the sounds that bots make discovered people are more engaged and accepting when a robot makes any kind of sound than when it doesn't, New Scientist reports. The findings, presented this month at the Human-Robot Interaction conference in Germany, suggest that sound can be a useful tool for robots to relate to humans.
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