Why is it so hard to make lasting changes in our companies, in our communities, and in our own lives? The primary obstacle is a conflict that's built into our own brains, say the authors. Psychologists have discovered that our minds are ruled by two systems - the rational and the emotional - that compete for control. While the rational mind wants change, the emotional likes comfort. Here the Heaths show how everyday people - employees and managers, parents and nurses - have united both minds and achieved dramatic results. Book jacket.