Check out this slideshow of robot hands from Wired. It tracks the evolution of the hand from the first attempts to duplicate the functionality of a human hand, to integration of self-monitoring proprioceptive and sensory capabilities, to replicating the anatomical and physiological structure of the human hand - both in order to better understand the biology, and to accommodate the connection of prostheses. On the way, it becomes obvious what a thing of complexity and beauty the human hand really is.
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Thanks for this one, Jess. It's fascinating.