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It’s taken millions of years for humans to perfect the art of walking. But researchers at NC State and Carnegie Mellon have discovered that we can get better “gas mileage“ using an unpowered exoskeleton to modify the structure of our ankles. The device puts an extra spring in each human step, reducing metabolic energy consumption by 7 percent below walking in normal athletic shoes — with potential benefits for users who could include military infantry, returning astronauts and stroke vi
