Part 1 Objects Regular Expressions Ranges Blocks Classes and Inheritance Modules Part 2 self Class Methods Class variables Class instance variables Metaprogramming? If we get to it class_eval http://www.railstips.org/blog/archives/2006/11/18/class-and-instance-variables-in-ruby/ http://www.jimmycuadra.com/posts/metaprogramming-ruby-class-eval-and-instance-eval