What is The Greatest Weapon in the World

As you wait for the next meteorite to come crashing down to earth sending mankind the way of the dinosaurs to be the new fossil fuel for the next generation of AI I have a question for you, maybe one of the most important questions of our time or any time. What is the most dangerous weapon in the world and who has it and more importantly is it aimed at you and me. See if you agree and if you do what are you going to do about it, what can we do about it.