Never have I witnessed such a valuable concept being expounded upon in such an appallingly bad manner. It is truly astonishing. Each chapter contains approximately two paragraphs of truly essential content. The remainder of the chapter consists of the author repeating the same message as those two paragraphs or restating the purpose of lateral thinking from the introduction. And the rest of the chapter presents a completely unfeasible "practice method" that depends on the highly unlikely scenario of you traveling back in time and ensuring that this book reaches the hands of your teachers when you were studying in school. It beggars belief. What an astronomical waste of time it has been to read this book. It is truly a disappointment and a frustration. One cannot help but wonder how such a potentially useful concept could be so poorly presented and made so inaccessible. It is a great pity.