I’d like to start this post with a joke I heard recently. A speaker at an important conference goes on and on for what feels like ages. At some point a guy just stands up and starts heading for the door. The speaker is taken aback and asks: Excuse me, where are you going? The guy turns around and answers: I’m going to have a haircut! Well – replies the speaker – couldn’t you do that before my talk? The guy looks at him and says: Well, no. Actually, I did not need a haircut before you started talking. On…