This story begins at a brain research lab in Massachusetts, and it will end there, too. But on the way it moves about the country, as I visit with my old Northwestern teammates and talk to them about the sport we played together years ago, the one that shaped us, rewarded us, wounded us. It was an uncertain time, the late 1960s and early 1970s, a time marked by the Vietnam War abroad and social unrest at home. Blows to the head were both figurative and literal for us young men. All around, things were escalating, ending, going up and down in flames. And through it all we played football. Where has it led us?