What if you don't have enough hands? Use your feet. Bear children like to use this when they learn arithmetic.
According to this simple logic, researchers at the University of Tokyo and Yingqing University in Japan have developed a wearable manipulator called metalimbs. This wearable device allows users to control through their legs and feet. There are many accessories, such as welding gun screwdriver, which can be used in different working scenes, and it also provides touch Feedback.
See how the foot controls the arm
Of course, the third hand is also defective. It can't be used when walking. Legs and feet move around. The equipment can't distinguish whether it's walking or commanding the manipulator.
In Sword Art Online, there is a setting that some muscles of the shoulder can control the wing flight. Maybe this robot can be controlled by a similar sensor one day, which is perfect. The hand already has, how to better control is not far away.
Have you thought about it? Why haven't humans evolved more arms?
You can look at this article to see how hard it is for this"handsome man"to say something? No fun phonation program