greatest number of challenges. that is the next 5 billion. >> when you ask, if you look back historically, many a of those things have not happened. you know, in the '50s people thought we wouldn't have jets and cars that fly and things like that. >> we'll still have those, just 50 years later. >> why do you think this is different? why do you think these things are different? >> the claims we're making are straight forward extrapolations of work that is going on now in labs. educated guesses based on trends that have continued for a very long time. if you go back to 10 to 15 years ago, the predictions about the arrival of the internet, the impact of personal information and so forth have all, in fact, come through. >> is the united states the central of the world for this stuff? >> for the moment. there's evidence that asia will get there. the number of engineers being produced in asia and the commitment of education in asia