Only gave it four stars instead of five because I think at this point it loses a bit of relevance because it is 10+ years old. But, overall, I think this is a remarkable book for anyone who wants to understand the fundamental workings of the modern PC. What's more, this book is well-written for a computer science book. A computer science writer who connects his paragraphs and writes effective lead-ins? Wow. Plus the humor is playful and provides enough smiles to make all of the boolean algebra more palatable. To think that all of our internet toys, our World of Warcrafts and our Tweets, our Youtubes and our Facebooks, our SQL databases, our overseas finance, even our spaceflight--everything about the modern world that computers make possible--all of it really just boils down to addition.