This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book argues that law-like statement of John Dewey's view of teaching permits description of the job of teachers as the work of creating educational energy. One way out of educational scarcity and into educational abundance is development of a general theory of teaching able to improve the education of students from all strata and segments of society. A useful strategy for helping teachers win their fight for the right to create educational energy among their students may be developed by taking a close, critical look at a mysterious but desired phenomenon in the educational inventory of the world: teachable moments. The self-correcting nature of science finds expression in the feature of the universal law of educational energy that it presents itself as a testable hypothesis.