What's the melting point of this sky material?  He never did manage to make Sather Garm understand what a melting point was.
Sather could not understand what a melting point is because he is stupid.
mnli hypothesis: Sather could not understand what a melting point is because he is stupid. premise: What's the melting point of this sky material?  He never did manage to make Sather Garm understand what a melting point was.