This book had quite an adventure. It started as a library book, made its way into a retail book store as a reduced sale item (as evidenced by its pricing stickers) and then ended up back at a different library in its sale section.
Having read Johnson's excellent The Invention of Air a few months ago (or so), I couldn't pass up this book, despite its subject material never really having interested me before. Johnson explains the book below
"The Most Important Fact of the Last 200 Years" Steven Johnson discusses THE GHOST MAP (#1) from Book Videos on Vimeo.
And there is more info and videos at Johnson's website.