Prosthetics have come a long way in a few years, putting leg amputees back in the walk -- and sometimes the race -- of life and giving arm amputees functional hands, writes Gloria Goodale. One potential solution that veterans are using is the DEKA bionic arm that allows such tasks as turning a faucet and raising a glass. But there's a hitch in the technology: cost, which can run into hundreds of thousands of dollars over a lifetime.

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