The health of the world's oceans is a growing concern but measuring ocean health is a complicated undertaking. Some people studying the issue focus on pollution, while others look at the health of corals or marine mammals. One project attempts to take a comprehensive picture of the health of oceans in order to provide information about Oceanic vital signs to stakeholders. The Ocean Health Index is the focus of this episode of Stats+Stories with guests Lelys Bravo and Julia Stewart Lowndes. Lelys Bravo is a Statistics Professor at the Department of Statistics at the University of Illinois at Urbana-Champaign. Before that she was a member of the Science Steering Committee of the Biospherical Aspects of the Hydrological Cycle project from the International Geosphere-Biosphere Program (IGBP) and Lead author of the Millenium Ecosystem Assessment report. Her research interests include spatial and temporal analysis of environmental data, including the development of risk assessment methods to evaluate the impacts of natural hazards under potential climate change. Julia Stewart Lowndes is a marine ecologist, data scientist, and Senior Fellow at the National Center for Ecological Analysis and Synthesis (NCEAS) at the University of California Santa Barbara. She champions kinder, better science in less time through open data science and teamwork. As a marine data scientist, Mozilla Fellow, and Senior Fellow at NCEAS, she has 7+ years designing and leading programs to empower science teams with skillsets and mindsets for reproducible research, empowering researchers with existing open tools and communities. She has been building communities of practice in this space since 2013 with the Ocean Health Index.