attack. >> it sounds like the concept of a polygraph. if i say, were you planning a terrorist attack and you get nervous and it has some response. is this kind of the brain version of that? >> it is. one of the reasons they're focusing on this brain stuff is that a lot of people are so dissatisfied with a lie detector test. if you're nervous or upset about the test, it gets past that and see if you can just get way into the brain to find out what only someone could now by following brain waves. it's not 100% yet. a long way to go. but this is a big step forward in this ultimate process of what scientists are trying to achieve, which is jumping inside the mind and figuring out what people are thinking. very interesting. >> it's a big "i." this can have so many implications about privacy. if this continues to gain ground, we'll be talking about it a lot more. >> we'll see. little while before minority