Thanks to Lauren for this one:
This is a very interesting robotics video about a man who uses his mind to control a biomechanical hand connected to his nervous system. He lost his left hand and forearm in a car accident and is now working to use a biomechanical hand. It is the first time a patient has been able to make such complex movements in a biomechanical hand using only his mind. Researchers are now working to be able to succeed in this with entire limbs.