now i am acing the class. >> the youtube numbers kept rising he got letter from the middle east, africa. >> what sal kahn has been amazing. >> he offers web lecture you ares from history, economics computer signs. his videos are viewed millions of times. >> not only reaching millions of students god forbid if i got hit by a bus outside it will still meet millions maybe eventually billions of students. >> you happen to be good at teaching? >> i will take that as a compliment. he's a great teacher. >> i hope that helps. >> it is really helping us learn a lot more. >> it is exciting he gets kids so excited about math. >> in most parts of life things have gotten much better cars and computers cell phones. education not so much. >> rewind out of 80 or 90 years