Martin Seligman, a renowned psychologist and clinical researcher, has been studying optimists and pessimists for 25 years. Pessimists believe that bad events are their fault, will last a long time, and undermine everything. They feel helpless and may sink into depression, which is epidemic today, especially among youths. Optimists, on the other hand, believe that defeat is a temporary setback or a challenge--it doesn't knock them down. "Pessimism is escapable," asserts Seligman, by learning a new set of cognitive skills that will enable you to take charge, resist depression, and make yourself feel better and accomplish more.