I think this topic was discussed a long time ago but I thought it would be nice to share since a lot of people are curious about hacking. Myself, I find the squabble of the powers that be on nuclear warfare amusing and of course disturbing as to what extreme measures they take in secret to avoid it. We shouldn't consider ourselves lucky we haven't wiped ourselves out yet, we should thank mother nature for not doing so with us through natural causes already. Carpe yolo.
I came across this and thought it was interesting:
https://www.youtube.com/watch?v=9rvIvvFZNkw
http://www.reddit.com/r/educationalgifs/comments/25ksru/the_chain_reaction_of_fission_inside_a_nuclear/
http://en.wikipedia.org/wiki/Stuxnet