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

Line 12: undefined method `ask_age' for Familiar:Module (NoMethodError)