Dale Earnhardt Jr. watches stock-car races from afar, not from his car. Where will Sidney Crosby be when his Penguins open their 2016-17 schedule?
Two sports; arguably the best players in them dealing with concussion symptoms and recovery. Three, if Cam Newton is added to the list.
Crosby and Newton play violent sports in which opponents try to knock them loopy. The NHL and NFL might deny that assessment, but it's undeniable.
Earnhardt wraps himself in a car, and his races aren't demolition derbies. Earnhardt's injuries came in an inescapable part of racing, crashes that drivers rarely control or anticipate.