Elizabeth Kulas

Cody Wilson makes gun-making machines. Depending whom you ask, he's either one of the most dangerous people in the world, or a hero of the first amendment.

Cody's never sold a gun. He's never killed anyone. And, to his knowledge, none of the guns he's made have ever killed anyone. So, how did Cody Wilson end up on the frontline of the debate over gun control? He ended up there, not by selling guns, but by creating ways for anyone to make their own gun.

Cody's game-changing tool? 3D printers.