. >> sal when i talked to you a few months ago you talked about flipping classroom. one things kahnis flipping you. also said the education system we inherited from prussia 200 years ago, prussia doesn't exist anymore and the system has to change. is that still your view? >> yeah, absolutely. this isn't a u.s.-specific thing. the prussian model of education, prussia was kind of the seed of modern germany, is the education model that's used everywhere including singapore and south korea and finland. >> what is flipping? i don't know what that is? >> flipping is the idea -- i started off making videos on youtube and getting letters from teacher you've give an reasonable lecture of photosynthesis or factors polynom polynomials. the teachers said let the students access their own time and pace. they don't have to be embarrassed if they forgot something. class time is all about problem solving what was dedicated to homework. that allows the classroom to be interactive, allows students to communicate with each other, teach each other and get the important part of the problem solving. >> d

i will ask sal kahn whether he is going to save american education when we come back. bake the world a better place with nestle toll house. hall we do is go out to dinner.? that's it? i mean, he picks up the tab every time, which is great...what? he's using you. he probably has a citi thankyou card and gets 2x the points at restaurants. so he's just racking up points with me. some people... ugh! no, i've got it. the citi thankyou preferred card. now earn 2x the points on dining out and entertainment, with no annual fee.to apply, go to citi.com/thankyoucards because you can't beat zero heartburn. woo hoo! [ male announcer ] prilosec otc is the number one doctor recommended frequent heartburn medicine for 8 straight years. one pill each morning. 24 hours. zero heartburn. >>> we are back talking about education. sal, you are at the forefront of what is often described as this revolution, finally the internet and information technology is gooing to revolutionize education, it's happening in the united states more than anywhere else. can this online learning a at the kahn a