> 5) You can calculate how powerful a nuclear weapon will be before setting it off. > 7) It would be hard to do a full nuclear exchange by accident and witho

> 5) You can calculate how powerful a nuclear weapon will be before setting it off. > 7) It would be hard to do a full nuclear exchange by accident and without any human being having decided to do that. > 17) When somebody raised the concern that maybe the first nuclear explosion would ignite the atmosphere and kill everyone, it was promptly taken seriously by the physicists on the Manhattan Project, they did a physical calculation that they understood how to perform, and correctly concluded that this could not possibly happen for several different independent reasons with lots of safety margin. Giving nuclear-weapons developers and scientists a lot of undue credit here