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Combining hardware with human bodies gains even more traction with these solar-powered retinal implants that spray a neurotransmitter substance onto retinal cells, restoring sight to the blind. There are no batteries required, either, because the whole thing is solar powered.

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The tiny 1.5mm chip flexes in response to low intensity light, stimulating nerves that send visual info on to the brain. The actuator has now been built by engineer Laxman Saggere of the University of Illinois at Chicago; no word on when we'll see this technology implemented in the real world.

Solar-powered implant could restore vision [NewScientist, via treehugger]