Bloodletting. Mercury. Lobotomies. Cigarettes endorsed by physicians. History is filled with moments when the smartest people in the room were absolutely convinced they were right. In this episode, we explore what happens when consensus collides with curiosity, why new ideas are often resisted, and the courage it takes to ask, "Are we sure?" From Semmelweis and Galileo to modern medicine, this is a conversation about certainty, humility, and the uncomfortable lessons history keeps teaching us.