Woodpeckers, bighorn sheep, and NFL players have something in common. They all take repeated blows to the head. But unlike their human counterparts, the birds and sheep don’t suffer brain injuries from their activity. Researchers think their trick is they adjust “the pressure and volume inside the skull so that their brains don’t slosh.” Can a new-fangled collar provided football players the same protection?

+ “He was robbed of the last fifteen years of life.” From the NYT: Ken Stabler Had Brain Disease C.T.E.