How do we know what actually works in healthcare? Health psychology relies on rigorous science, not intuition. In this topic, you will step into the shoes of a researcher to examine how psychologists design ethical studies, collect data, and utilize statistics to uncover the root causes of health behaviors. We will look closely at different levels of analysis—from a microscopic cellular level to a broad societal scale—and critically evaluate the unique ethical responsibilities involved in conducting cross-cultural research within diverse, multicultural populations.