the author david grann is your man. today he's one of the world's top-selling writers, in part, because of his hands-on, years-long research that breathes life back into his fearless characters. but grann is the first to admit -- >> i am not an explorer. i mean, i would have been the first to die on the island. let's be perfectly honest. >> what's the cause of death? we're going to play this out. >> terror? [ laughter ] >> i'm lesley stahl. >> i'm bill whitaker. >> i'm anderson cooper. >> i'm sharyn alfonsi. >> i'm jon wertheim. >> i'm cecilia vega. >> i'm scott pelley. those stories tonight on "60 minutes." ♪ i have type 2 diabetes, ♪ ♪ but i manage it well. ♪ ♪ it's a little pill l with a a big story y to tell. ♪ ♪ i take ononce-daily jardiancnce, ♪ ♪ a at each dayay's staaartr♪ ♪ as s time went t on it w was easy toto seee ♪ ♪ i'm l lowering mymy a1c. ♪ jajardiance woworks 24/7 in youour body to f flush out s some sugar! and d for adultsts withth type 2 didiabetes and known n heart disesease, jajardiance cacan lower

tales of david grann, tonight. >>> we end tonight in colorado, a state with a spectacular landscapes us, a place putting one man's life in focus. >> reporter: this is where colorado photographer john fielder works. capturing nature, spring colors, the quiet of winter. now he faces a challenge greater than any nature threw at him. i want to talk about your cancer. john has pancreatic cancer. you have probably seen as much as any man of nature. birth, life, death. i sometimes have the sense talking with you, john, that it informs the way that you are approaching death is part of life. help me understand this. >> living in the moment. sounds like a cliche but living in the moment, living in the present is medicine for me. and it allows me to appreciate the past and the future. but by always being focused on what i've been given today, not yesterday or the day before. >> reporter: he took over 200,000 pictures. now culled down to the best 7,000 with memories, not always good. >> when i raft rivers, i make mistakes, i flip upside down, and i have to get the boat rightside up again. i los