And the kids of the world, those millions of innocent 14-year-olds who walked from their algebra class to the nearest screen, have repaid Invisible Children by turning "Kony2012" into one of the most viral products in history.

CNN: Opinion: After Kony, should kids decide our morals?

In an elementary algebra class at the college taught by math instructor Ben McGahee in the summer of 2010, Mr. Loughner was an immediate nuisance and often nonsensical, Mr. McGahee said.

WSJ: Loughner's Prior Behavior Pointed to Signs of Imbalance