if a time machine existed, would it be possible to travel back in time to accomplish some thing? the immediate answer is no because no, but stick with me. what if, for our species to survive, we had to go back in time. but, of course, if we did send ourselves back in time and saved our species then there’d be no reason to go back in time to save our species, so we’d never save it. i have a solution: give the machine and the schematics to some young adventurers with the annotation “always send people back in time”.