Lamar Jackson and the Ravens look to stave off Tom Brady and the Buccaneers, while the 49ers and Rams battle to keep pace with the Seahawks (?!) in the N.F.C. West.
Using a confrontational style honed in the ring, Dr. Christopher Nowinski challenges the N.F.L. and other leagues to acknowledge the link between concussions and chronic traumatic encephalopathy.
Tom Brady, Aaron Rodgers, Russell Wilson and Matt Ryan have been among the N.F.L.’s most successful quarterbacks over the past 15 years. Their disappointing starts this season are unique in their own ways.