The fate of the world hangs on two volatile characters of doubtful sanity.
"I went from VERY successful businessman, to T.V. Star, to President of the United States (on my first try)," Donald Trump tweeted earlier this month. "I think that would qualify as not smart, but genius ... and a very stable genius at that!"
People don't describe themselves as "very stable," except defensively. Doubts swirl, among layman and expert.