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March 14. Denying Our Ignorance. There is much about nature that we do not understand: how it works, how we change it, and how changes in turn affect us. How should we incorporate this intractable ignorance when thinking and making decisions? How does science deal with it? We’ll look at burdens of proof; the wisdom of precaution; discounting the future; and the cultural challenges of anticipating mistakes and preserving second chances in a society that values individual liberty. Special guest, Carolyn Raffensperger, Executive Director of Science and Environmental Health Network