By Jason Zweig, includes “At first glance, the Pennsylvania Public School Employees’ Retirement System, one of the largest pension plans in the U.S., doesn’t sound anything like you or me. … Yet, at the most basic level, this gigantic retirement plan is just like you and me: It is struggling to raise returns in a low-interest-rate world. That can breed desperation, and wishful thinking, for anyone with a portfolio large or small. …”