Working together with another human is extremely easy, we can verbally communicate and instinctively adjust our movements depending on what the other person is doing. Having this level of collaboration with a robot yet possible but if it was it could make tasks big and small both easier and safer.
Researchers from MITs CSAIL department recently displayed a new way of communicating with robots via muscle movements. The user wears EMG sensors on their bicep and tricep while a control system constantly checked for changes in the user's muscle state and then performs different actions depending on the changes.
You can read more about the robot and how it works here!