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Difference Maker Mel West promotes a vehicle that gives dignity and mobility to disabled people

The rugged, hand-powered wheelchairs, made by volunteers, are distributed in more than 100 countries.

Scott Schaefer/Courtesy of PET/File

In Vietnam, Le Thi Thanh contracted polio at the age of 2, lost the use of her legs, and spent the next 20 years having to crawl to get around.

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