Defining methods inside a module in Ruby

I'm learning ruby, I come up on something that I don't understand. I know that modules in ruby are used for namespacing with :: (or .) and mixing with include directive. The problem comes when I group some methods inside a module, without putting them inside a class. Here's an example:

module Familiar
  #this will not work
    def ask_age
      return "How old are you?"
  #this will work
    def Familiar::greeting
      return "What's up?"
# this call returns **NoMethodError** 
# this call works fine

Why do I need to include the namespace to define the method, I'm already inside the namespace Familiar why do I have to repeat my self and put Familiar::greeting You can test my example online following this link:

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