In Kenya, 22-year-old entrepreneur Norah Kimathi has developed a robotic hand with her startup ZeroBionic that directly translates a teacher's voice into sign language. Of Kenya's 300,000 deaf or hard of hearing children, only a fraction attend school, partly because the country lacks a standardized sign language. The robot hand, 3D-printed from recycled plastic waste, costs 350 dollars, lasts three...
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