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Concussion mystifies Vikings' Henderson

Erin Henderson is making his way back from a concussion, but he still doesn't have a lot of answers for an injury that is treated differently than others.

Injuries are a part of life in the NFL. Players will be the first to admit that, even at this early stage of the season, nobody feels 100 percent. They're banged up and their bodies are adjusting to the pounding that they take. But Erin Henderson has spent the last two weeks trying to recover from post-concussion symptoms that have mystified him, his coaches and the team's medical staff... Recommended Stories