"How do we know what we know?" is a great organizing question for the year. This session is led by a Humanities teacher, Crissy Calera ; how do we know we can trust her guidance? Well, her presentation is well-grounded and supported by many tools that we use in the OER Project. The "four-corner" exercise mirrors well the work with do with "Claims Testing," in which our four corners are Logic, Evidence, Authority, Intuition. The charge to "avoid blinding accepting so-called facts" is a great reminder to engage continually in the historical inquiry process. Her connection to earlier historical periods, in which we formulate the question "How do professionals know what they know?" is a great pivot to analyze sources and evidence held up by others to shape our understanding. One important feature of this session is the power of constructivism; students learn to construct meaning through questioning, exploration, and analysis.