One of the keys to the stealth capability was its faceted design. The concept is that curved surfaces have a larger radar cross-section. The idea of making all surfaces flat to reflect radar away from the receiver seems a pretty sound concept. It must have been pretty effective, since they had to treat the windows because the pilot's helmet had a major effect on cross-section.
But all of the low-observable aircraft made since, such as the B-2 Spirit and even Lockheed's own F-22 and F-35 have a significant amount of curved surface area.
Why has the fully-faceted concept not carried over into newer low-observable designs? Does it just have too much negative affect on handling characteristics?