'It's an incentive to try to be optimistic,' physician says
                                
                                
                                    (Newser) -
                                    Feeling gloomy about life, the universe, and everything? Then take note of a new study that links optimism to heart health and a handful of other health positives,  EurekAlert  reports. Analyzing data on more than 5,100 adults, researchers found that the most optimistic are twice as likely to be...