I wonder if my perception of how the hand works is the same as reality. I imagined there was hardly any muscles in the hand itself, the muscles that control the hand are inside the arm. Kinetic energy is transmitted from the arm to the hand through tendons. I also thought there are structures inside the hand that keeps the tendons close to the bone so when they flex, they don't stick out or bulge.
I also wonder what dolphins would do if they had hands because they are very intelligent, would they make stuff? Perhaps they would make a steam punk type world where technology is the same as mankind but without electricity.