"In games there are rules," writes science-fiction author Kim Stanley Robinson, "but in life the rules keep changing." This is always true, of course, but I think it will be an especially poignant truth for you between now and your next birthday. During the coming months, you may sometimes feel as if every last law and formula and corollary is mutating. In some cases, the new rules coming into play will be so different from the old rules you've been used to, they may be hard to figure out at first. But now here's the happy ending: It may take a while, but you will eventually see that these new rules have an unexpected logic and beauty that will serve your future well.