Scientists have found that the brain is capable of producing its own antidepressant, which suggests that meditation and other self-soothing techniques may have real benefits for easing anxiety and depression. In a study of mice, animals forced to swim until they gave up and began floating were able to regain their will to live by hearing a sound that was associated with safety. Experts say this finding suggests that people can be taught these skills, and also may point to new routes for...