Bad guys co-evolve with your defenses -- tax code, software and NBA rules all need to constantly evolve, as does GoogleLink
Evolutionary computation: represent individuals as genetic strings, i.e. 110100101
Test individuals for fitness -- how good they are at finding and exploiting loopholes
Mutate and crossover to get individuals who are better and better at solving your problem -- at finding loopholes.
In 2002, Sussex researchers tried to design an osscilator using evolutionary computation, but found it ended up weird because of unintentional RFI emission from a nearby PC
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.