Twitter's teapot held a new tempest Sunday, this one brewing over astronaut Scott Kelly's approving quote of Winston Churchill. Within half a day, buffeted by digital waves of outrage, Kelly retracted his words, tweeting that he did "not mean to offend by quoting Churchill" and pledging to educate himself "further on his atrocities." Was Churchill a "grotesque racist and a stubborn imperialist, forever on the wrong side of history" — or a stalwart defender of freedom against the evil of Nazism, a man prone to the errors of his age but admirable nevertheless?