Ken Burns and Lynn Novick bring The Vietnam War's horrors to those born too late to witness it

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For those of us born after 1975, the Vietnam War is not far enough in the past to feel detachedly academic, not recent enough to form a clear opinion on. What we know of the war is through its images and soundtrack: 16mm film footage of low-flying helicopters grazing the tops of rice paddy fields; the guitar line of…