Within a single generation, the Web and digital media have remade nearly every aspect of modern culture, transforming the way we work, learn and socialize in ways that we are only beginning to understand.
The National Football League, a multibillion-dollar commercial juggernaut, presides over America's indisputable national pastime. But the NFL is under assault as thousands of former players claim the league has covered up football's connection to long-term brain injuries.
