By Lynn Marek, includes “Illinois Teachers' Retirement System, the state's biggest pension fund, is relying heavily on risky, expensive investments as it tries to claw its way out of a quicksand of unfunded pension liabilities. … That TRS investment strategy poses a threat to pensioners' retirement income and stands to exacerbate the burden for taxpayers already on the hook for $138 billion in unfunded liabilities across all Illinois pensions.”