First and foremost, this booklet is available for free on my website "efficientfrontier-dot-com," you'll have to click through a few links. (Amazon doesn't allow discrete web links.) Many readers, however, have asked for a hard copy version suitable for gift giving; here it is. With that out of the way: For years I've thought about a project to help today's young people invest for retirement because, frankly, there's still hope for them, unlike for most of their Boomer parents. All they'll have to do is to put away 15% of their salaries into a low-cost target fund or a simple three-fund index...