The hardest thing for humans to persuade each other of is priorities. Should you be an exercise freak? A computer wiz? A classical-literature buff? A badass hiker? A game maker? A dedicated volunteer? A great cook? These are all worthy activities, each enriching your life and likely the lives of others. Our pasts lead us to a mix of a few obsessions, and hopefully we keep our minds open to many more. Those of us who commit to honing that one art may index [sic] excel at it. But for my doomed attempt at convincing you of how to arrange your life, I suggest a solid interest in, oh, three or five Big Things. They will compete for your attention, and the vagaries of fate will lead you toward one, then another. Things you learn in the first will improve you in the second, then bring you to a whole new third. You will be a happier and better person for branching out a bit.