Is Russia behind a secret weapon that’s targeted dozens of American diplomats and spies?

The biggest stars in the world are pledging their brains. Young players are leaving the game with their destinies unfulfilled. The stories they tell spark fear and raise questions. And the science hasn’t even begun to provide answers.

The former NHL tough guy tells his story of head trauma, depression, and his search for peace.

I don’t want to die. But, you know, nothing is for certain. And I’m tired of keeping quiet.

The NFL is doing everything it can to avoid paying former players who have dementia.

“Football as we know it is done, because the lawyers are here.”

A profile of NASCAR Dale Earnhardt Jr., who is returning to racing after a series of concussions.

Suspecting he had CTE and that it would eventually kill him, a former high school football player kept a diary of what was has happening to his brain.

He was supposed to be the Dallas Cowboys’ star running back. Instead, Joseph Randle is in prison.

“Oh my God, the NFL is using every trick in the book to market to kids.”

A retired fighter worries that he has all the symptoms of CTE.

“The concussion that led Borland to retire came on a routine play, and that’s precisely his point.”

When should a football player, and in particular one who has suffered three concussions in 10 months, retire?

The flawed data on safety equipment.

A profile of NFL commissioner Roger Goodell.

Meet Gene Locks, the onetime Princeton quarterback suing the NFL on behalf of 4,000 former players.

Just days after suffering a concussion, a 17-year-old fullback hangs himself. Inside his family’s journey to learn if a brain injury is to blame.

The story of former Vikings linebacker Fred McNeill and the lasting impact of his concussions.

The demise of an NFL player.