there's, like, a lag to the fact that i'm actually falling. and then you're on the end of the rope, and you have to try again. >> reporter: the crowd, watching from below, were just small dots, but two of those dots were caldwell's wife, becca, and their son, fitz. becca said to me that she thought sometimes you're more comfortable hanging off a mountain than you are on flat ground. >> yeah. i'm pretty comfortable up there. and pretty much in awe of the rest of life. i'm super clumsy. i'm not very smart. >> reporter: you're super clumsy. >> i'm not very smart. i forget stuff all the time. >> reporter: but on the-- on the wall there-- >> yeah it all comes together. >> reporter: over the last 19 days, it all came together to make rock climbing history. john blackstone, cbs news, yosemite national park. >> schieffer: and that's the news. for scott pelley, and all of us here at cbs news, i'm bob schieffer. good night. captioning sponsored by cbs