Ten-year-old Pham Duc Duy is cradled in the arms of his mother, Nguyen Thi Thanh Van, 35, in their house in Hanoi June 16, 2007. Vietnamese doctors believe Duy, whose grandfather served in the Vietnam war, is a victim of exposure to dioxin passed down the generations. Several major U.S. chemical companies are directly accountable for supplying the U.S. military with dioxin, or "agent orange," during the Vietnam War and causing widespread dioxin poisoning, a lawyer for Vietnamese plaintiffs told a federal appeals court on June 18, 2007. Picture taken June 16, 2007. REUTERS/Kham (VIETNAM)