The California State Teachers’ Retirement System, the second-largest public pension system in the nation, is weighing a new strategy in which it would move up to $20 billion of its $191-billion portfolio into bonds and other safer bets to lower its risk of losses, the Los Angeles Times reports. The fund’s investment committee met Wednesday to discuss the plan amid the recent volatile stock market. But, of course, there is a big problem: the move would hinder the fund’s ability to attain its investment target of 7.5 percent, which it needs to help meet its obligations.