“Engineers ... are not superhuman. They make mistakes in their assumptions, in their calculations, in their conclusions. That they make mistakes is forgivable; that they catch them is imperative. Thus it is the essence of modern engineering not only to be able to check one's own work but also to have one's work checked and to be able to check the work of others.” CreativityLearningEngineering Book:To Engineer Is Human: The Role of Failure in Successful Design Source: To Engineer Is Human: The Role of Failure in Successful Design