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In this photo taken Aug. 7, 2012, Vo Thi Thuy Nga, 24, left, and her uncle Vo Duoc sit inside their home in Danang, Vietnam. She was born with physical and mental disabilities that a rehabilitation center's director said were caused by their parents' exposure to the chemical dioxin in the defoliant Agent Orange. Washington was slow to respond, but on Thursday, Aug. 9, 2012 the U.S. for the first time will begin cleaning up leftover dioxin that was stored at the former military base, now part of Danang's airport. (AP Photo/Maika Elan)

Agent Orange cleanup begins in Vietnam

Dioxin, a persistent chemical linked to cancer, birth defects and other disabilities, has seeped into Vietnam's

soils and watersheds, creating a lasting war legacy that remains a

thorny issue between the former foes. Washington has been slow to

respond, but on Aug. 8 the U.S. for the first time will begin cleaning up dioxin from Agent Orange that was stored at the former military base, now part of Danang's airport.