Acknowledgements: I undertook this project in the summer of 2013 with the hope of helping students avoid the high costs of textbooks, generating content that could be used and improved upon by others, and tailoring my materials to my own needs. I hope you will enjoy and disseminate it widely. This project is a team one and many people deserve credit. First, the H20 team for helping to create this product and teach me to use it: Dustin Lewis, Emily Ellis, Matthew McKay‎ and Shailin Thomas. Second, my team of RAs/TAs who helped me edit materials, generate new content, etc. They are: Jerry Cedrone, Jeremy Feigenbaum, Laura Myron, Ashwin Phatak, and Veronic Sauer. For Fall 2014, Noah Marks helped me to update the content to reflect the 2013 term and generally improve the materials. Finally, I thank my colleague Bill Rubenstein for letting me adapt some of the content he uses in his course. - I. Glenn Cohen