2018-01-26 13:42 thomas.godart If time travel is possible, does it mean it has already been used? Published: 2015-07-28 If time travel is possible, does it mean it has already been used? description Thomas Godart http://www.thomasgodart.com/p/en/ideas/if-time-travel-is-possible-does-it-mean-it-has-already-been-used labelQuora check_box_outline_blank labelpersonal check_box labelidea check_box_outline_blank labelanswer check_box_outline_blank labelpublication check_box_outline_blank