This global economy of recent years has been a quite a lesson in risk. Even those who thought they were prepared for the worst were, well, undone. From wall Street to Washington to Main Street, Americans learned a lot about the losing end of risk. Of course, some made big bets and were duly rewarded. There's more to risk, however, than buying a stock, gambling at a casino or taking out an adjustable rate mortgage. Sometimes risk is more subtle and passive; we put ourselves at risk by logging on to a computer or a hand-held device. A lot has been learned about how the average human's brain is hardwired to deal with risk. Take our quiz and learn how much you know about risk and risk aversion.