Archival data, when read with ultraviolet technologies, reveals traces like the shadows left on X-ray images. This interactive and technological form of reading disrupts conventional categorizations of popular science, literature, authorship, gender and identity. Alan Hart provides an early example of how our contemporary lives are mediated by medicalized ways of seeing. New technologies (like the not-so-new X-ray technology) mark us as data, alter our relationships between public and private, ownership and participation, and assign us roles and identities as data-based subjects alongside voices of marketing.