As the alarm clock reminds us every morning, our lives are on the meter.<br />As such, human beings typically make to-do lists that can't be achieved in one day.<br />But according to Mother Nature Network, there's a way to make one so that it actually gets done.<br />'Time To Parent' author Julie Morgenstern says it's simple: think like a mathematician.<br />Estimate how long each task should take. Then, subtract that time from the time available to work that day. <br />