Sony's robodog has moved on to virtual-pet heaven, but it's still one of the sleekest nonhuman companions ever constructed. From its built-in camera to its ability to recognize 100 voice commands and its groundbreaking artificial-intelligence core, the Aibo was one sleek hound.
It reached number 44 on PC World's list of the top 50 gadgets of all time. Sony finally euthanized its cyberpup in 2006.
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