'11/22/63' by Stephen King
Stephen King posits in his new thriller “11/22/63,’’ that there’s theory number three: history is flexible. Your backward travels can warp the course of future events (as long as you don’t create a paradox, like challenging yourself to a duel). You could time-trek to 1963 and off the assassin who’s about to kill President Kennedy. “11/22/63’’ wonders if changing that watershed moment would prevent the country’s escalation in Vietnam, save the lives of RFK and MLK, - in short, cure the latter half of the 20th century’s ills and make 2011 a better place.