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grab a miller lite vortex bottle. taste greatness. hey, look. i made t-shirts!some. >> jon: welcome back. my guest tonight, an author. his new book is called turn right at machu picchu. rediscovering the lost city one step at a time. please welcome to the program mark adams. sir! nice to see you. thank you for joining us. >> a pleasure to be here. >> jon: i had no idea that the machu picchu was so... i guess controversial. that it needed to be that the gentleman who discovered it i guess was hiram bingham. >> he was a yale lecturer who found it just about 100 years ago exactly and caused a little controversy because he later took full credit for finding machu picchu and left out the fact that there were three families of farmers living up growing tomatoes among the ruins when he got there. he came back a year later. >> jon: do native people count? >> that is part of the controversy. >> jon: and you decided to retrace bingham's path to machu picchu. >> yes. he did a famous expedition in 1911 on which he was looking for the lost city of the incas which was this le

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grab a miller lite vortex bottle. taste greatness. hey, look. i made t-shirts! awesome.(cheers and applause) >> stephen: welcome back, everybody. thank you so much. ladies and gentlemen, my guest tonight has a nobel prize. big deal. all my guests do. (laughter) please welcome al gore. (cheers and applause) mr. vice president, thank you so much for joining us. (cheers and applause) what an honor to finally have you near wither underneath the glare of my scorn. (laughter) now, sir, let's get some politics out of the way first, may we? >> of course. >> stephen: okay. rick perry endorsed you in 1988. >> yeah. >> stephen: will you return the favor? (laughter) right now and endorse rick perry. >> well, it would hurt him a lot. (laughter) >> stephen: is that an endorsement. >> no, it's not. >> stephen: so because an endorsement would hurt him and you won't endorse him isn't that in itself an endorsement? >> um... you could put it that way. >> stephen: i just did. >> yes! he was a democrat back then. i don't know what happened. >> stephen: weren't we all. (laughter) i've got a l