This is my third science and general knowledge book by National Geographic, the others being "National Geographic Answer Book" and " The Knowledge Book". Since all three are of a similar theme, it obviously introduces comparisons and presents the question - aren't they all just the same book with a different cover? Indeed a valid question, since these days it is quite common to find the same book under different names and covers and consumers are getting constantly burned by discovering they have purchased the same book more than once.
However I am happy to report, that although it would have been easy for NG to rehash material from its other seemingly similar books, they have done a splendid job at differentiating each book so that all of them are worth owning. Of course, all three books sometimes introduce similar concepts, but each of them explains it in a different way and uses different visuals to do it. You won't find any cheap copy-pasting going on here - all three books are completely unique and stand on their own merits.
Out of these three, "The Science Book" is obviously most science-oriented and goes deeper in its explanations of various concepts, whereas "The Answer Book" or "The Knowledge Book" sometimes just mention things in passing without much explanation. The latter two also have a wider scope to cover, so this is understandable. The explanations in "The Science Book" are mostly satisfying and eye-opening. Depending on your level of knowledge, some of the chapters may seem overly simplistic, whereas you may find yourself struggling with others. For me for example, the chapters on computers, the internet and IT felt very basic, yet I had to seriously rack my brains to make sense of many of the articles on mathematics (and to a lesser degree chemistry and physics).
As for the visuals, although I am partial to the Doring Kindersley way of producing highly visual books, I must say I am very satisfied with the National Geographic way of doing things as well. They take a bit more traditional approach to book layouts with smaller visuals among larger blocks of text, but there are still hundreds upon hundreds of graphs, photos and schematics to break up the monotony, so I never felt bored. DK books are of course the pinnacle of graphic book design, but NG is no slouch either.
Overall I am very happy with the book and although it took me over three months to finish, it is definitely a keeper and a book I see myself referring back to in the future as well. Highly recommended!