The key goals of this course are to warn you of the dangers you face and to give you some insight on what could be done to avoid those dangers. My challenge in this course is to make vivid to you that the dangers of nuclear weapons, far from being historical curiosities, are existential dangers today. You will have the opportunity to engage in discussions about these topics with both world experts and peers from around the globe. You can take this course any way you wish. We have organized the course segments in a logical order, both chronologically and thematically. However, each segment stands alone and can be viewed independently.