However, the author seems to be afraid that we do not understand or forget it. So he employs many - too many examples to explain every little point. It begins with a super simple example, super clear. At the end of this example, it is highly unlikely not to have understood what it meant. But each time, he described again all with another example, and again and again .... until the physical principle stated he wanted to bring. Similarly, at more advanced chapters it re describes some past examples ... In short all this lengthens the 600-page book, when he could make a half. For my part, I wanted to many times not to continue my reading (so bored watching me read dozens of pages without learning anything more than what I had read in the same book) .