Pensions are among the most important investments American workers and employers make. We work for years so that when the time comes, we can retire with enough income to live comfortably, enjoy the much-deserved leisure time, and engage in activities of our own choosing.

This week's cover story examines Iowa's and Illinois' pensions, which, when coupled with health-care benefits, are in grave danger of insolvency, threatening to potentially bankrupt Illinois. This is due to the unsustainable "defined-benefit" pension plan that promises each employee a percentage of his or her annual income, regardless of the amount of contributions made by the employee, or on the employee's behalf by the employer (the state's taxpayers), over his/her years of service.

[Note: Commentary from the Reader's editor, published on this topic, can be found here.]

A riddle: What do you get if you add $209 billion to $54 billion to $15 billion?

If you answered "a lot," you're correct and not particularly inclined toward math.

If you answered $278 billion, you're adept at arithmetic and correct, if literal-minded.

If you answered the respective unfunded liabilities for Illinois' state-run pension funds, its retiree health-care system, and its pension bonds, you're correct and probably cheating.

And if you answered "a time bomb," you're probably most correct. Because while the numbers are important, they're constantly changing and open to interpretation, and the most important aspect of them is their magnitude. Whether it's cast as an $83-billion pension problem or a $278-billion benefits issue, the sheer size of it shows that it can't be solved with tinkering.