"Energy, the Subtle Concept", a great overview of the history and physics of energy that doesn't avoid equations: http://www.amazon.com/Energy-Subtle-Concept-d

"Energy, the Subtle Concept", a great overview of the history and physics of energy that doesn't avoid equations: http://www.amazon.com/Energy-Subtle-Concept-discovery-Feynmans/dp/0199546509/ref=sr_1_2?ie=UTF8&qid=1291647026&sr=8-2 http://www.amazon.com/Energy-Subtle-Concept-discovery-Feynma... "The Four Steps to the Epiphany" needs no introduction. The first couple of chapters really drove home some mistakes I have made in past projects.