Collier: As we evolve, our sports must evolve, too

Collier: As we evolve, our sports must evolve, too: "This is where we are: With an epidemic of concussions blazing through schoolboy football (22,000 a year in Pennsylvania alone), and a leap forward in the clinical understanding of chronic traumatic encephalopathy (the likely scientific answer to questions like 'What killed Mike Webster, Terry Long, Andre Waters, et al.?'), we are now viewing football through a new prism of risk. Which is why I wanted to talk this week with Dr. Micky Collins, who walks on both sides of that prism."