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do this at nasa, there would have never been someone on the moon. so the more we ask how and the less we ask, can we do it, the safer we are as a species. >> and the more likely we are to travel, mountains beyond mountains. the title of the book profiling dr. farmer and his quest to cure the world. >> and as proof that it was the right thing to do, please observe a rainbow just appeared over your left shoulder. clearly a sign from god. >> somebody is listening. >> from harvard to haiti to heaven. >> i'm probably not headed to the third destination. >> i think you've done enough good in your life. >> i'll keep trying. >> to learn more about paul farmer's work and to see all these on your laptop, your tablet, stories and more, our series lift on. your smartphone at cnn.com/championsforchange. you'll also find links to all the organizations we featured tonight where you can volunteer,

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