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2:30
Daniel Ellsberg's daring act of conscience during the Vietnam War.
2:18
The Killing Fields of Cambodia remain largely unexplained. Until now.
2:17
A documentary that lifts the veil on a radical environmental group.
2:34
130 million migrant workers journey to their home villages every Chinese New Year
1:49
Luis Soriano brings books, via two donkeys, to the poor children of rural Colombia.
0:30
Premieres Thursday, August 16, 2012 at 10:00 p.m. ET/PT. Check your local listings.