Gary Weimberg, the guy with whom I had endless conversations about what everything in the world means when we were both very young, grew up to be a producer of documentaries. He and his partner Catherine Ryan have produced a film called Soldiers of Conscience, about American soldiers who went to Iraq to fight for a cause they thought was right – and reached the difficult conclusion that no cause justified killing. The film is showing tonight in America on PBS. If you are in the land where PBS broadcasts, you can click here to find out when the show will air where you live. There will be a chat on the PBS site tomorrow.