This human-related Kinect hack, comes from a team of researchers from the College of Computing, Georgia Institute of Technology. They created a game for deaf children, which they called "Copycat". Copycat help deaf children to improve their memory skills, by practice sentence construction n american sign language. To make it, they used the Georgia Tech Gesture Toolkit to train Hidden Markov Models. During their test, the recognizing system achieved an astonishing 98.8% success in recognizing a sentence. Read more in their website.