There used to be an established order to the world. A structure to things. You couldn't print a gun like a term paper. It was impossible to wreck a nuclear production plant with a few lines of code. Flying robots didn't descend on you in the dead of night and kill you in your home.

But that order has been upended. Cheap videos in California help spark riots in Cairo. Lynchpins of the Middle East now rant about 'Planet of the Apes' in public, and Iranian generals trash-talk David Petraeus over SMS. The world has gone a little haywire — sometimes for better, sometimes for worse. Here are our choices for the 15 people most responsible for making it that way.

— Noah Shachtman