The N.F.L. Struggles to Tackle Its Latest Problem: Tackling - The New York Times

Expert Ties Ex-Player's Suicide to Brain Damage - The New York Times

The violence and force of an NFL tackle - The Washington Post

Collective Force of Head Hits Increases Odds of CTE, Study Says - The New York Times

What are the NFL's new kickoff rules, and are they really safer?

Struggling Giants trade defensive lineman Leonard Williams to first-place Seahawks

Who are the best available NFL free agents? Justin Simmons, Odell Beckham lead list - The Athletic

What is C.T.E.? - The New York Times

How the N.F.L. Stays So Popular, Despite Its Many Scandals - The New York Times

Evolution of the NFL Player