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Some robots such as Saika (developed in 1996) and Poppy (developed in 2013) are designed to resemble humans so that people will find it easier to interact with them. To that end, certain features such as bipedal locomotion can help to _______ the effect of the more unnatural aspects of a robot’s appearance, but a robot that looks too human can fall into the “uncanny valley,” meaning that its appearance unintentionally unsettles those who encounter it.