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diff --git a/book.htm b/book.htm
@@ -25,21 +25,19 @@ <h1>Python for Informatics: Exploring Information</h1>
 <a href="http://www.amazon.com/gp/product/1492339245/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=1492339245&linkCode=as2&tag=drchu02-20" target="_new">Amazon</a>,
 <a href="https://www.createspace.com/4430203" target="_blank">
 CreateSpace</a>, 
-of 
+or 
-<a href="http://www.amazon.com/dp/B00K0O8HFQ" target="_new">Kindle Store</a>.  Note that you can also
+<a href="http://www.amazon.com/dp/B00K0O8HFQ" target="_new">Kindle Store</a>.
-use the free MOBI format below for the Kindle as well.
 <p>
 Here are free copies of the book in various formats:
 <p>
 <ul>
-<li><a href="html-009/" target="_blank">HTML</a></li>
+<li><a href="html-270/" target="_blank">HTML</a></li>
 <li>PDF
 (<a href="http://do1.dr-chuck.com/py4inf/EN-us/book.pdf" target="_blank">English</a>,
 <a href="http://do1.dr-chuck.com/py4inf/KO-ko/book.pdf" target="_blank">Korean</a> from <a href="https://github.com/statkclee/py4inf-kor" target="_blank">Victor KC. Lee</a>)
 </li>
-<li><a href="Python-For-Informatics-008.epub" target="_blank">EPUB</a></li>
+<li><a href="epub_270.epub" target="_blank">EPUB</a></li>
-<li><a href="Python-For-Informatics-008.mobi" target="_blank">MOBI</a> for Kindle</li>
+<li><a href="html_270.zip.zip" target="_blank">Download HTML in a ZIP</a></li>
-<li><a href="html-009.zip" target="_blank">Download HTML in a ZIP</a></li>
 <li><a href="http://itunes.apple.com/us/book/python-for-informatics/id554638579?mt=13" target="_blank">Apple iBooks at iBookstore</a> (1.3GB)</li>
 <li><a href="http://www-personal.umich.edu/~csev/books/py4inf/ibooks//python_for_informatics.ibooks" target="_blank">Apple iBooks direct Download</a> (1.3GB)</li>
 <li>Partial translations in progress:

diff --git a/book_270.epub b/book_270.epub
diff --git a/book_270.mobi b/book_270.mobi
diff --git a/book_270.pdf b/book_270.pdf
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diff --git a/html-270/book.html b/html-270/book.html
diff --git a/html-270/book001.html b/html-270/book001.html
@@ -0,0 +1,107 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="generator" content="hevea 2.09" />
+<link rel="stylesheet" type="text/css" href="book.css" />
+<title>Preface</title>
+</head>
+<body>
+<a href="index.html"><img src="contents_motif.gif" alt="Up" /></a>
+<a href="book002.html"><img src="next_motif.gif" alt="Next" /></a>
+<hr />
+<h1 class="chapter" id="sec1">Chapter&#XA0;0&#XA0;&#XA0;Preface</h1>
+<h2 class="section" id="sec2">Python for Informatics: Remixing an Open Book</h2>
+<p>It is quite natural for academics who are continuously told to 
+&#X201C;publish or perish&#X201D; to want to always create something from scratch
+that is their own fresh creation. This book is an 
+experiment in not starting from scratch, but instead &#X201C;remixing&#X201D;
+the book titled
+<em>Think Python: How to Think Like
+a Computer Scientist</em>
+written by Allen B. Downey, Jeff Elkner, and others.</p><p>In December of 2009, I was preparing to teach
+<span class="c009">SI502 - Networked Programming</span> at the University of Michigan
+for the fifth semester in a row and decided it was time
+to write a Python textbook that focused on exploring data
+instead of understanding algorithms and abstractions.
+My goal in SI502 is to teach people lifelong data handling 
+skills using Python. Few of my
+students were planning to be professional 
+computer programmers. Instead, they
+planned to be librarians, managers, lawyers, biologists, economists, etc., 
+who happened to want to skillfully use technology in their chosen field.</p><p>I never seemed to find the perfect data-oriented Python
+book for my course, so I set out 
+to write just such a book. Luckily at a faculty meeting three weeks
+before I was about to start my new book from scratch over 
+the holiday break, 
+Dr. Atul Prakash showed me the <em>Think Python</em> book which he had
+used to teach his Python course that semester. 
+It is a well-written Computer Science text with a focus on 
+short, direct explanations and ease of learning. </p><p>The overall book structure
+has been changed to get to doing data analysis problems as quickly as
+possible and have a series of running examples and exercises 
+about data analysis from the very beginning. </p><p>Chapters 2&#X2013;10 are similar to the <em>Think Python</em> book,
+but there have been major changes. Number-oriented examples and
+exercises have been replaced with data-oriented exercises.
+Topics are presented in the order needed to build increasingly
+sophisticated data analysis solutions. Some topics like <span class="c001">try</span> and
+<span class="c001">except</span> are pulled forward and presented as part of the chapter
+on conditionals. Functions are given very light treatment until 
+they are needed to handle program complexity rather than introduced 
+as an early lesson in abstraction. Nearly all user-defined functions
+have been removed from the example code and exercises outside of Chapter 4.
+The word &#X201C;recursion&#X201D;<sup><a id="text1" href="#note1">1</a></sup>
+does not appear in the book at all.</p><p>In chapters 1 and 11&#X2013;16, all of the material is brand new, focusing
+on real-world uses and simple examples of Python for data analysis 
+including regular expressions for searching and parsing, 
+automating tasks on your computer, retrieving data across 
+the network, scraping web pages for data, 
+using web services, parsing XML and JSON data, and creating 
+and using databases using Structured Query Language.</p><p>The ultimate goal of all of these changes is a shift from a 
+Computer Science to an Informatics
+focus is to only include topics into a first technology 
+class that can be useful even if one chooses not to 
+become a professional programmer.</p><p>Students who find this book interesting and want to further explore
+should look at Allen B. Downey&#X2019;s <em>Think Python</em> book. Because there
+is a lot of overlap between the two books,
+students will quickly pick up skills in the additional
+areas of technical programming and algorithmic thinking 
+that are covered in <em>Think Python</em>.
+And given that the books have a similar writing style, they should be 
+able to move quickly through <em>Think Python</em> with a minimum of effort.</p><p><a id="hevea_default0"></a>
+<a id="hevea_default1"></a>
+<a id="hevea_default2"></a>
+As the copyright holder of <em>Think Python</em>,
+Allen has given me permission to change the book&#X2019;s license 
+on the material from his book that remains in this book
+from the
+GNU Free Documentation License 
+to the more recent
+Creative Commons Attribution &#X2014; Share Alike
+license.
+This follows a general shift in open documentation licenses moving 
+from the GFDL to the CC-BY-SA (e.g., Wikipedia).
+Using the CC-BY-SA license maintains the book&#X2019;s 
+strong copyleft tradition while making it even more straightforward 
+for new authors to reuse this material as they see fit.</p><p>I feel that this book serves an example of why open 
+materials are so important to the future of education,
+and want to thank Allen B. Downey and Cambridge University
+Press for their forward-looking decision to make the book available
+under an open copyright. I hope they are pleased with the 
+results of my efforts and I hope that you the reader are pleased with
+<em>our</em> collective efforts.</p><p>I would like to thank Allen B. Downey and Lauren Cowles for their help,
+patience, and guidance in dealing with and resolving the copyright 
+issues around this book.</p><p>Charles Severance<br />
+www.dr-chuck.com<br />
+Ann Arbor, MI, USA<br />
+September 9, 2013</p><p>Charles Severance is a 
+Clinical Associate Professor 
+at the University of Michigan School of Information.</p>
+<hr class="footnoterule" /><dl class="thefootnotes"><dt class="dt-thefootnotes">
+<a id="note1" href="#text1">1</a></dt><dd class="dd-thefootnotes"><div class="footnotetext">Except, of course, for this line.</div>
+</dd></dl>
+<hr />
+<a href="index.html"><img src="contents_motif.gif" alt="Up" /></a>
+<a href="book002.html"><img src="next_motif.gif" alt="Next" /></a>
+</body>
+</html>
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