joel kline is the former chancellor of new york city's school system. we one of the most innovative educators in the world and of course the founder of kahn academy. joel, you have seen these results for years. what do you think is the big take away from this set of results? >> the clear take away is we're stuck and we're not getting the results we need with our kids and we're going to pay a huge price if we don't change, change quickly and change rapidly. two points that people should understand. piza tests the kind of skills that the market is going to demand t kind of higher order, complex thinking that in a global high-tech economy our children need to have if they're going to succeed. and the failure to have those skills is going to mean they're not going to be able to get the jobs they want. the world is changing so rapidly. that's the first take away, the second take away, this is not a problem with poor children or children who grew up in deprived environments, this is a problem across the board in america. our highest performing kids are not rem