If the facts are unpalatable or outlandish-as the hell of the camp seemed to many Jews, and some Allied leaders-denial and cognitive dissonance can stifle the urge to act.
A Friday-night purist might proclaim Ms Yeh's challah to be inauthentic and so unpalatable; ditto the idea of serving Chinese-seasoned eastern European bread with a dish from Yemen.
But before we try to emulate geniuses or encourage our children to do so we should note that some of the things we learn from them may prove unpalatable.