" What is it about a hand that seems quintessentially human? The answer must, at some level, be that the hand is a visible connection between us; it is a signature for who we are and what we can attain. Our ability to grasp, to build, and to make our thoughts real lies inside this complex of bones, nerves, and vessels. "

― Neil Shubin , Your Inner Fish: a Journey into the 3.5-Billion-Year History of the Human Body