Stefan Helmreich is Professor of Anthropology at MIT. He is the author of Alien Ocean: Anthropological Voyages in Microbial Seas (University of California Press, 2009) and, most recently, of Sounding the Limits of Life: Essays in the Anthropology of Biology and Beyond (Princeton University Press, 2016). His essays have appeared in Critical InquiryRepresentationsAmerican Anthropologist, Environmental Humanities, and The Wire.