khan academy is nonprofit, noncommercial.keep the learning on khan academy, especially in math, because that's where the gaps hit the most. as you go back to school, hopefully your teachers are going to use our get ready for grade level courses. don't stress about it. if your children can get 20 or 30 minutes a day in math, reading, and writing, they will be ok, but if they don't get that, then we could get into some of these scarier scenarios. emily: sal, we've got about now a minute left. you are joining us as part of some special boston coverage coming up. you started your career in boston. it is a place with many educational institutions. how much of an impact at the city have on you and the original khan academy idea? 30 seconds. sal: i went to undergrad and grad school in boston. huge impact on me. khan academy, in many ways, my undergrad -- i went to m.i.t. -- they did great coursework in the early 1990's and 2000s. they said knowledge should be free to the world and took that upon themselves. when i started khan acade