Why is it that we know something but don't act accordingly? This question becomes urgent in the face of issues that require immediate action, like global-warming, meat-production, sexual violence, racism, exploitative working conditions. "Death is a master from Germany," the poet Paul Celan wrote -- given the long denial of the death-camps, we could also say: "Denial is a master from Germany." This class traces a series of catastrophic (quasi-)events in German history and discusses global analogues. Yet we also explore the philosophical problem of knowing: when are we too sure that we know something, too quick to accuse others of denial?