If you are an optimist, you notice that good things happen to you, and you feel grateful for them. If you’re a pessimist, you probably don’t pay attention to positive things as often, and when they do happen, you believe them to be chance occurrences. Psychologists suggest this simple test: Open a door for an optimist, and the chances are she will thank you. A pessimist is much less likely to even notice the door being held for
