Words of Importance - Learning Curve

I am sure you must have experienced this. There are those times when a word keeps jumping up at you. You hear it from one friend and, then, it pops up in an email, screams from a news article and thumbs its nose at you from a hoarding. Well, recently, it seemed as though some divine commandment had gone out to everyone - "Thou shalt slip in the phrase 'learning curve' if you happen to be in the