and the role we play wi educati can get exp tions at your own time a whenever you want, i think it allows the classroom to not be about lecture anymore, but instead about interacting with each other, doing projects, doing simulations. >> was there a moment when you realized, wow, this is really something that will take off? b job, but was there a eureka moment? >> most comments on youtube were thank you. that was a big deal, most of the comments are not thank you. but then i started getting letters from folks all over the planet saying, hey, this is why i was able to pass algebra class. this is why i want to be a physicist now. this is why i retired from the military and am able to go back to college. so there is the potential it could reach millions. >>> up next, we're "on the money." it's the smartphone app that recognizes music and can name that tune in seconds. now shazam can see as well as hear. >>> later, america's reining american pharoa the horse that won the triple crown has won american hearts as well. what's next and what's next for him as well? we'll take a break and leave you