The Amazon Fire Phone's Dynamic Perspective—the famed "3D effect"—works almost as if by magic. As you look at the phone and move it around, the Fire Phone watches you back, and changes what you see. It's not voodoo, though. It's crazy camera tech.

Facebook relationship statuses completely revolutionized the art of "figuring out whether that person you want to bang is single." It made it as easy as a search. But some sneaky people leave that drop-down menu empty, or protect that info from non-friends.