than the last. and so i think even if you don't always feel it, as a candidate, you have to communicate optimism because that's what our country is based on, you know, the hurrahs and always offering a better vision than where we are today. >> what are some of the ideas that are changing the world? >> he starts out with something we've written about before, about the rise of mobile phones and how there's a u.n. study last year showed that mobile technology, mobile phones, is the single greatest engine for decreasing poverty in human history. i mean, it really is kind of amazing. and he tells examples. he's traveling all over the world, you know, people in haiti using cell phones to pay for crops, people in africa using it in a way, it's become the vehicle of the economy. and it's a democratizing force. it allows people to buy and sell things in a way that really hasn't existed before. and again, it triumphs over, you know, the infrastructure problem in places like haiti and africa have, that man, you don't have