THIRD DEGREE: SHOULDER ROLL 
To find your arm's third degree of freedom:
- Point your entire arm straight at the screen.
- Now, roll your entire arm from the shoulder, as if you were screwing in a light bulb.
This rotating movement is called roll. Your shoulder has 3 of
your arm's 7 degrees of freedom.
 Return to the arm menu
Our robot on the HyperTech does not have this
particular degree of freedom - it only has 6.
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