Being pessimistic may keep your heart from being broken when a best-case scenario fails to come to pass, but there are some real health benefits to seeing the glass as half full.
원문출처 : http://www.cnn.com/2016/12/30/health/how-to-be-optimistic/index.html
원문출처 : http://www.cnn.com/2016/12/30/health/how-to-be-optimistic/index.html