> We never did figure out why it worked in one part of the world but not another Doesn't that indicate further research is needed? It sounds fascinating to me.

> We never did figure out why it worked in one part of the world but not another Doesn't that indicate further research is needed? It sounds fascinating to me. (I know it isn't interesting for the people who couldn't get it working.) It also might indicate that the original research was incomplete in the sense that it might be a fluke due to specific conditions in the original country which isn't universal.