Hinge PointsNorth Korea remains a puzzle to Americans. How did this countryone of the most isolated in the world and in the policy cross hairs of every U. S. administration during the past 30 yearsprogress from zero nuclear weapons in 2001 to a threatening arsenal of perhaps 50 such weapons in 2021? Hinge Points brings readers literally inside the North Korean nuclear program, joining Siegfried Hecker to see what he saw and hear what he heard in his visits to