004 Nuclear episode - War, peace, and nuclear Weapons - part 2 of 3 Hard Topics, Easy English

In part one, I asked my friend Francisco what he knew about nuclear weapons: Who made them, who has them, and why. In part two, Francisco asks me some interesting questions about nuclear weapons, war and peace: Would we be safer if there were no nuclear weapons, or if every country has one? Should we be worried about North Korea and Kim Jung-Un using a nuclear weapon? What's the connection between nuclear energy and nuclear weapons? Should nuclear scientists be able to research whatever they want, or should there be limits? How is the war in the east of Ukraine connected to nuclear weapons?