While many scientists are pledging to March for Science across the country on Earth Day, April 22, some of their colleagues plan to sit this one out. They warn that the very act of identifying their work as a special category of human endeavor could lead to further political fissures and misunderstandings about what science is, how it is done, and what it is for. The science activist community, on the other hand, is encouraging PhDs and those of us without them to get out a