Amazon.com Review: Considering this volume is a mere 668 pages, it does a remarkable job of covering the major concepts and facts of biology, human anatomy, chemistry, physics, astronomy, Earth sciences, meteorology, environmental sciences, and engineering. Not surprising, as it was written by the New York Public Library staff who know what questions are most frequently asked by a knowledge-hungry public. The ultimate test of such a reference volume is scrutiny of areas with which one is intimately familiar, then reading up on areas about which one is woefully ignorant. This book passed both tests: The biology chapter was sound (though I wanted much more information about evolutionary principles), and the section on particle physics was informative. Even if you already have a collection of several thousand books covering most of the sciences (like myself), this is a handy reference. And if you're a student or want access to a lot of scientific knowledge in the smallest possible non-digital package, this resource is essential for those times when you simply can't get to the library.