This is pretty freakin' amazing.
Basically, scientists at Duke University took monkeys and wired their brains up to a computer. They then taught the monkeys how to play a video game using a joystick. Then, they took the joystick away. Now the monkeys can play the game and move a robotic arm <i>using only their mind</i>. Yes, that's right.. they move a robotic arm with their thoughts.
The scientists hope their research will help in the development of neuroprosthetic devices for paralyzed people.