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