Revelations about a relationship between the author and a girl who was 16 when they met shocked readers, but not scholars of his work. Now there’s a debate about how much she influenced his writing.

The hedge fund investor predicted last year that President-elect Donald J. Trump’s political fortunes were on the rise.

Tit-for-tat moves this week included the use of American-made ballistic missiles to strike inside Russia, and new nuclear threats from Moscow. Neither appear to have influenced the war on the ground.