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#! /usr/bin/env ruby

class Human
  def initialize(name)
    @name = name
  end
  
  def special
    puts "#{@name} is normal, no special abilities."
  end
  alias_method :abilities, :special
end

class Hero < Human
  attr_accessor :powers
  
  def special
    super unless @powers
    puts "#{@name} is a hero - he/she can #{@powers}"
  end
end

mohinder = Human.new('Mohinder')
mohinder.special   # Mohinder is normal, no special abilities.
mohinder.abilities # Mohinder is normal, no special abilities.

peter = Hero.new('Peter Petrelli')
peter.powers = "mimic the powers of other heroes nearby, fly, and read minds"
peter.special   # Peter Petrelli is a hero - he/she can mimic the powers of other heroes nearby, fly, and read minds
peter.abilities # Peter Petrelli is a hero - he/she can mimic the powers of other heroes nearby, fly, and read minds