Alex, a graduate student studying human biology and evolution, writes, "As an undergraduate at I was fortunate enough to study On Growth and Form by D'Arcy Thompson. His synthesis of mathematics, classics and biology was an inspiration to me, and drove me to pursue science as a career. Though I am now studying to be a paleoanthropologist, my tattoo of an (idealized) ammonite fossil is a reminder to me of the material and mathematical processes behind all living things. Plus extinct cephalopods are more aesthetically appealing than hominin skulls." Click here to go to the full Science Tattoo Emporium.