enumerable.rb

def each(&block)
  node = @head
  while node
    block.class(node.value)
  end
end

#A minix a way of adding extra data to the class without having to use inheritance; 
#You can only inherit from one class, a way to get around this is to created mixins; 


module Mother
    def eyes
        :blue
    end
end

module Father
    def hair
        :purple
    end
end

class Son#You can only inherit from one things
    include Mother
    include Father
end

class Daughter < Father
end

module Insect
  class Butterfly
  end
end

Insect::Butterfly 

ActiveRecord::Butterfly #This will group all of the Active Record classes together, it prevents conflicts very carefully;