In an interview this week, Republican presidential hopeful Jeb Bush weighed in on one of the zeitgeist's silliest questions: If you could go back in time, would you kill a baby Adolf Hitler? "Hell yeah, I would!" Bush told the Huffington Post when queried on the subject in New Hampshire. "You gotta step up, man." -snip- [The question raises] ethical dilemmas - could you murder an infant on the assumption it would save millions of lives? - and even prompt[s] overly elaborate discussions on the theoretical mechanics of time travel. It's not clear how much of these considerations Bush chewed...