Five people moved in tandem down a trail, connected by a wheelchair unlike any other.
This hiking trail, popular with Bend, Ore., families, is a testing ground for inventor Geoff Babb. One miscalculation about how to navigate a tight squeeze of boulders, and he could topple over the edge toward an ice-cold river below. But that's not what worried Babb, who hasn't walked since a stroke 14 years ago.
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