Say something to the table. They answer you, and they answer each other, the way a real seminar table works, not a queue of one-at-a-time replies. Both scientists are historical figures represented for education, each carrying a real backpack of live sources, Wikipedia and arXiv, so watch for how they cite (or refuse to invent) a source. A cheap "director" model decides who speaks next each beat, favoring genuine back-and-forth over a fixed rotation. Free to use, built for Biology: Albert Einstein and Marie Curie Come Alive, PTX 4990: Independent Study, AI Agents and Critical Thinking.