Open Textbooks

• http://catalog.flatworldknowledge.com/bookhub/reader/128#fwk-redden-ch01_s01
• http://www.ck12.org/biology/Mitosis-and-Cytokinesis/lesson/Mitosis-and-Cytokinesis/?referrer=concept_details
• http://cnx.org/contents/_VPq4foj@6.1:HKkfLPmJ@5/Domain-and-Range
• http://open.umn.edu/opentextbooks/BookDetail.aspx?bookId=61
• http://open.umn.edu/opentextbooks/BookDetail.aspx?bookId=219

Interactive Illustrations

• http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html
• http://astro.unl.edu/classaction/animations/coordsmotion/sunpaths.html
• http://astro.unl.edu/classaction/animations/coordsmotion/celestialhorizon.html
• http://astro.unl.edu/classaction/animations/binaryvariablestars/centerofmass.html
• http://astro.unl.edu/naap/motion3/animations/sunmotions.html