Acknowledgements

This text was assembled using various pages from Wikipedia as my source. I copied text passages from many Wikipedia pages, remixed, edited, adapted and suplemented it with my own words to assemble the chapters of this text. I make this text available as an open educational resource under Creative Commons Attribution-Share Alike 3.0 Unported United States License (same as Wikipedia) for others to do as I did and freely copy, remix, edit and adapt as required. Illustrations with associated hyperlinks are from Wikimedia Commons, which should be consulted for copyright details. Pictures and illustrations that I generated myself are subject to the Creative Commons Attribution-Share Alike 3.0 Unported United States License. I want to thank all the contributors and supporters of Wikipedia for making it possible and keeping it relevant. I am grateful for the support provided by the Roxbury Community College’s OER initiative “RCC Go Open” and wish to thank the members of the OER Task Force and library director William Hoag for their unwavering commitment to OER. With your support and help this text can only get better over time. I urge you to email me with your criticisms and suggestions at .