achieve. where you see where they're confused. you see where they're bored. i also get to take kids around to neat places, you know, like my son and i have been to particle colliders and computer museums and all sorts of unusual things that are kind of stimulating. >> not everyone has guided tours of particle colliders with bill gates, but a young silicon valley tech guru is trying to give kids a customized education using technology. >> what i want to do in this video is try to figure out what "x" is. >> meet sal khan. the accidental creator of khan academy. a not for profit website that's turning heads. >> we want to figure out what bdc is. >> seven years ago he was working at an investment firm when he began tutoring his little cousin in math. when scheduling time got difficult a friend of kahn's made a suggestion.