Imagine you were phoned up out of the blue by a researcher from Harvard University and asked what you were doing, how were you feeling and what you were thinking? Research reported in the journal Science found that’s what happened to 2,250 people around the world who were contacted at random. All the responses pointed to one startling finding. We tend to be in a happier state of mind if we are focused on some activity rather than if we are day-dreaming. Apparently at any one moment 47% of us are not concentrating on anything in particular even when we are carrying out some activity. And even when we are day-dreaming about some pleasant topic, we are less happy than if we are engaged and absorbed in something.