Bottom line: this is a truly enjoyable book that ultimately succeeds in shedding light on complex things in the world that we may not have paused to consider (submarines, ICBMs and various space travel vehicles) in depth. This lack of consideration may variously result from the inherent complexity of some things (nuclear power plants) or their ubiquity (pens, pencils, roads and bridges).Randall Munroe compiled his own list of the 1000 most common words (presumably in American English) to use as the lexicon to explain a bunch a stuff. The illustrations are wonderful; crisp line drawings that vary in detail from the conceptual (human organs generally as bags) to the highly detailed. In some cases they are complete visual metaphors, presumably because the limitations in available vocabulary led to limitations in the accompanying picture.This book contains content from my own professional background, so I was delighted to see content pulled from the worlds of naval weapons, space systems and modern information technology. Because of this, I can confirm that even with limited vocabulary, he gets those things explained correctly.Anybody who has worked as technical writer trying to glean information from subject matter experts for later use in a user guide or other materials designed for non-experts will appreciate what Munroe has done here. Anybody who has ever prepared materials for consumption by elected or appointed government officials will also totally appreciate the challenge he takes on.Interspersed throughout --in the same simple language-- are short comments that are sometimes insightful, sometimes funny, and they will be instantly familiar to readers of his xkcd web comic.However, don't read this in one sitting. You might find yourself haunted by this thought: "Randall, you tell us in the intro that eventually you picked your own 1000 words based on a review of multiple lists. The addition (or substitution) of 50 to 100 more could have really taken moved some of the explanations from the highly metaphorical to the more concrete (to his credit, the "things" are "correctly" named in the table of contents).Great fun for the alpha geeks and curious kids in your life...and just in time for holiday shopping.