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Questions of societal import have both normative (what should be done) and descriptive (what is the case) dimensions. In this chapter, we address disagreements about the latter through the lens of political cognition, a research effort spanning cognitive psychology and experimental political science. We consider various explanations for fierce disagreements about "facts on the ground" and find that first, extensive evidence shows that judgments sort by political partisanship. Second, individual differences in threat sensitivity and uncertainty tolerance predict partisan group membership, which aids understanding of group differences but not necessarily differences in descriptive beliefs. Third, no evidence suggests a historically unusual deficit in scientific understanding. Fourth, some evidence implicates well-studied features of thought (confirmation bias, motivated reasoning), but these features appear to be symmetrical across the partisan divide. Finally, emergent evidence implicates people's assessments of information sources, processes that are also susceptible to motivated reasoning and partisan cueing and moreover are challenged by a media environment that is historically unusual. We conclude that the most promising conceptualizations of disagreement over empirical matters will acknowledge that partisan cues are often valid cues indicating the beliefs of people's groups and address difficulties of information source assessment in our current, unstable information environment.

Where people live, what they eat, how careful they are about taking their medications, and even what they do in their spare time are very much related to the quality of their lives and their health-related outcomes. While our genetic makeup accounts for a significant portion of our health outcomes, we know that health is also heavily influenced by what are known as social determinants: education, wealth, neighborhood safety, housing, and health literacy, among many others. Throughout the day, we face many decisions that have a direct or indirect impact on our health and quality of life. Many of these choices can be influenced toward healthier options by behavioral interventions. This chapter presents behavioral insights and interventions that have a high potential to impact the health of community members, reduce disparities, and improve their overall quality of life. These insights and interventions range from increased medical adherence to improved nutritional choices using nudges, regulations, provision of information, or rewards for positive behaviors.