i'm joined now by sal ckahn, founder of the kahn. r business is about linking technology in the classroom. is there a limit to how much technology a child should be exposed to? >> yeah, there's a limit to how much of anything a child should be exposed to. even reading a book is a great thing. but if a child sits and reads a book for 12 hours a day and doesn't play with peers, it's an issue. and you have the same thing with technology. >> what do you think about the age for an ipad? somebody who wants to know what is an appropriate age for a child for christmas, assuming you don't put it on a credit card and can pay it off, those are our big rules, what is an appropriate age? >> it's important to make sure kids don't expect big-ticket items and really appreciate it. but we had a friend who got an ipad for their 2-year-old and we thought they were spoiling them and it was an inappropriate gift and a couple years ago i got an ipad and my 18-year-old took it over. overall, i think it's a pretty impressive thing for them. i think historica