Our very existence is based on cycles of action and reaction; the actions of those that came before us, and the reactions that shape our present and future. On November 25th, 2012, TEDxRyersonU celebrated those who have grasped an abstract idea and transformed it into a tangible reality. From the heart of a Canadian National Historic Site, Toronto's revitalized Mattamy Athletic Centre (formerly Maple Leaf Gardens), speakers, students, and organizers alike shared in the spirit of ideas worth spreading. less