WARNING: MINI FINANCE LESSON AHEAD.... When it comes to investing, most people invest in large caps and small caps and think they're all set. What they don't know is they're missing the one thing that will make their portfolios truly complete: mid caps. Moreover, they're missing State Street Global's mid cap, MDY. And the middle can make all the difference. We created a world of missing middles to prove just that. And we had a lot of fun doing it. Below is the launch spot of the campaign. More goodness to come!