snopes.com: The Unsolvable Math Problem and Lastest Solved Math Mystery Both of these are great true stories.
For his birthday I bought Stan three small volumes:
50 Mathematical Ideas (you really need to know) by Tony Crilly
50 Physics Ideas (you really need to know) by Joanne Baker
and Natural History Museum (London) Diary for 2010 (full of great photographs with technical details)
I thought they (the first two books anyway) would provide some info on great topics we could explore together, and followed along the lines of our "normal" conversations... at least one branch of our chats.
Many times we find ourselves going from current events to political philosophies. I'm grateful to every single one of my professors (at UGA) for giving me some ground on which to stand during these rigorous examinations of theory and current trends! Believe me, Stan gives me no - zero, nada - intellectual slack.