Which genre of science writing contributes most to public understanding, and how does that understanding happen? Working within a science in society approach, this paper examines public engagement with science as it occurs in the comments and discussion boards of r/science. Researchers use content analysis to identify relevant concept categories and code comments for interaction with science content. The resulting data are analyzed by genre (scientific news journalism, press release, and research article) and open access status, revealing differences in public engagement with implications for science communicators and scholars seeking to understand how the public interacts with science news.