CONTENIDO: Conversation : The science behind six degrees : It's not just who you know. It's who they know and who knows the people who know them / Duncan Watts. -- Tool : The ethical leader's decision tree : Exposing conflicts between corporate actions and corporate ethics early can help head off bad decisions / Constance E. Bagley. --Idea: When to put the brakes on learnig : Learning-focused management teams can actually depress company performance / J. Stuart Bunderson and Kathleen M. Sutcliffe. -- Books in brief / John T. Landry