For example, psychological research shows that cancer survivors often report a higher quality of life than people who have never had cancer at all.[25] This could be physiologically protective because they have been able to use the traumatic experience to evoke an increased sense of meaning and purpose.[26] This relates to the concept of psychological resilience or an individual's ability to cope with challenges and stress. Self-enhancing was found to be correlated with resilience in the face of the 9/11 tragedy among participants either in or near the towers.[27]