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 Salem State University’s OER initiative.