With co-funding from the National Science Foundation, the Mercury Project has added three new teams to the consortium, bringing the total to 18 teams working around the world to increase vaccination and science-based health decision making. The new teams will test whether an interactive video-based decision aid can help improve patients’ understanding of the risks and benefits of vaccinations, test new theories of vaccine decision making, and explore the role of local models of illness and trust in shaping health decisions in rural Namibia.