What is condensed matter physics? (revised)

I have just rewritten chapter 1 of Condensed Matter Physics: A Very Short Introduction.  I obtained very helpful feedback on my first version from a freelance editor. This has given me fresh eyes for the whole manuscript, which I am now rewriting. She suggested moving some strong material from later chapters into the first chapter, particularly the fact that CMP is all about emergence. I have also benefited from other readers and blog commenters. For example, David Sholl's asked about how CMP is different from other approaches to materials science.

Here is the new version. 

I welcome comments. But, again you are probably not my intended audience. Rather, it is your family, undergraduates, or colleagues in biology or social sciences.

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