WW IV

If is there is a World War III, there's a very real possibility it will result in everyone on Earth dying, and if the global population is zero, there won't be a World War IV.

So I'm taking this quote with a grain of salt, even though you're taking this quote as gospel.

https://www.goodreads.com/quotes/14977-i-know-not-with-what-weapons-world-war-iii-will

It might still be a misquote. But it was also in the Oppenheimer movie