>(possible only in "unmoderated reactors", and I don't know what that means) I'm fairly sure that refers to a nuclear reactor gone into meltdown. By the time y

>(possible only in "unmoderated reactors", and I don't know what that means) I'm fairly sure that refers to a nuclear reactor gone into meltdown. By the time you've knocked together enough particles to make gold nuclei it's quite hard to calm the thing down again...