I'm reading Beyond Fear by Bruce Schneier. I'm most struck by examples of security failures. 'Hole in the wall' gangs that make a hole in the side of a house/building to avoid the security system. The airplane hijacker who demanded $200K and 4 parachutes when he landed, then took off again and jumped out the back staircase. Apparently inspired a bunch of copycats, which then prompted modification of the 727 rear staircase so it couldn't be opened during flight! He also says insects are often great examples of attack/response evolving, in weird ways. Fun so far.