Unlike most living things, human beings are able to reason. We all intuitively understand how to reason and do it every day. Science is a highly refined and rigorous form of everyday reasoning. We can become better scientists and improve our day-to-day lives by learning to describe, analyze, and evaluate reasoning. This cluster leads learners on a guided tour through the essential ingredients of reasoning---claims, evidence, and arguments---and takes a deep dive into common cognitive biases and rational fallacies that impede our ability to reason as well as we can.