The advantage of this series of books. The material is given in a summary. Removed all the "water," lengthy reasoning, long calculations. They offer you. A short but capacious 30-second article about architectural styles, economic theories, the origin of the gods and heroes of Ancient Greece, the basics of the brain, chemical elements, scientific discoveries, the structure of internal organs, key subjects of the Bible. All books are beautifully decorated with color illustrations. And they can be used as support materials to prepare for exams. And by downloading it into a smartphone - like a spur. Let them not replace full-fledged textbooks and reference books. But they will become a "beacon" with an in-depth study of the subject. Allow "not to break your head" about professional slang and complex concepts of scientists.