Episode 11 of The Ascent of Man, Knowledge or Certainty, is a profound reflection on the philosophical and ethical dimensions of scientific inquiry. Presented by Dr. Jacob Bronowski and directed by Mick Jackson, the episode explores the limits of what science can know and the dangers of seeking absolute certainty. In a powerful segment filmed at Auschwitz, Bronowski makes a moving statement about the misuse of science and the moral responsibility that comes with knowledge. This episode is widely regarded as one of the most impactful in the series for its blend of science, history, and humanism.