Since I'm unsure where else to place this recommendation, I'll take this opportunity to put it here. I'm currently reading the book The Self-Made Tapestry: Pattern Formation in Nature and absolutely loving it. It deals with advanced topics in a way that's so easy to understand I imagine it could be taught to fourth graders. Each chapter deals with a type of pattern, such as bubbles, or cracks, or waves, and discusses several examples of where those patterns appear and why, and what that indicates about the pattern. I'm not a physicist, but I'm reading the book because the experience is less like learning about physics and more like learning about common heuristics of thought.