It was billed as the documentary that Roger Goodell and the NFL didn't want you to see. PBS' Frontline aired its long-awaited special—League of Denial: The NFL's Concussion Crisis—on Tuesday night to a bevy of support (and buzz) from the football community. In terms of media attention, only ESPN's 30 for 30 draws this kind of anticipation and reaction as a documentary series. For those that were not able to watch it live or forgot to set the DVR, the near two-hour special is available on Frontline's website. As you may remember, this is the documentary that ESPN first assisted...