I do not think that there is someone that doesn't know the world's most popular puzzle: The Rubik's cube, even if he/she does not know it by it's name (learn it now: Rubik's cube).Zachary Grady and Joe Ridgeway, students at Rowan University in New Jersey, seems that knows it quite well. As a matter of fact, Ridgeway can solve it in 45 seconds. These two friends built a robotic pneumatic arm from a scratch, and created the software that can solve the cube in some 15 seconds. If you taken into account that most people does not solve it at all, then this time is super fast. The system uses a camera to "read" the scrambled cube. The camera then sends the data to a computer, which runs the algorithm to solve it. The solution is then translated into movements and are sent to the pneumatic arm. Read more in this article.
And for those who think that robots can easily beat a human being in complex jobs, well, think again... Here is a video with the former official world record.