or down. or they can be very complex. so, for example, you and i might decide to bet different ways on some portion of a bunnen of mortgage-backed securities, a credit defauld swap we won t get into that what that is the key part that s a risky bet. when that bet blows up, it can mean lots of big losses for banks. that s one of the reasons that the financial bust that occurred back in 2007 was so severe. and that the problem that senator warren is trying to do something about, this was something we addressed in dodd/frank, that is when those risky derivatives blew up, they were held in the part of the bank that gets insured by the federal deposit insurance and back stopped by the federal reserve. so they have a government backstop. that puts taxpayers at risk. dodd frank took the risky derivatives out of the insured part of the bank and put them