In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash, hand only, 

In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash, hand only, holds a 1945 photograph, in his Boston home, that shows survivors at what is believed to be the Nazi Mauthausen concentration camp. The photo was taken by Nash's grandfather U.S. Army medic Donald Johnson. Nash's discovery of photographs by his grandfather led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
Associated Press
In this Tuesday, April 2, 2013 photo filmmaker Matthew Nash, hand only, holds a 1945 photograph, in his Boston home, that shows survivors at what is believed to be the Nazi Mauthausen concentration camp. The photo was taken by Nash's grandfather U.S. Army medic Donald Johnson. Nash's discovery of photographs by his grandfather led him to create a documentary about the liberation of the Ohrdruf concentration camp in Germany, the first that the Americans found. (AP Photo/Steven Senne)
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