Minkel ambitiously tries to explain the key concepts of modern physics in short, two-page articles with only mixed success. Brevity, while seen by many as the superior alternative to long-winded pretentiousness, often is achieved at the expense of necessary detail and nuance. While it's nice to have a quick summary of the individual planets of the solar system, it's overly optimistic to try to intelligently discuss relativity, dark energy, and string theory in essays that could be fit onto a 3X5 notecard. I plan to keep this book on my shelf, though, because I think each mini-chapter could serve as a good starting point for additional reading.