To Do or Not To Do-The Need-to-KnowList-making is a pretty personal thing. Some of us border on obsessive, organizing the bathroom can turn into a series of numbered bullet points. Others prefer to wing it, writing important telephone numbers on the backs of their hands. But even the most basic outline of must-do tasks can help us tackle our most important goals. For one thing, writing out a bunch of to-do's forces us to set concrete goals (take out...