DefCon's more than 6,000 attendees hack everything: their cars, to increase horsepower and remove pesky safety and emissions controls; their brains, using biofeedback receptors attached to videogames to relieve anxiety disorders; even the war in Iraq. One Navy engineer gave a presentation detailing the nine months he spent hacking insurgent bombs, jamming their radio frequencies to prevent detonation.

"The people who built the Mars rovers are hackers," says Jeff Moss, also known as "Dark Tangent," the hacker who has organized DefCon for the last 15 years. "We generally like hacks that aren't nefarious, that involve figuring something out from the ground up. That's what we try to reward here."

At Forbes.

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