Dale Earnhardt Jr. has concussion
Updated: October 15, 2012, 8:59 PM ET
ESPN.com news services
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Dale Earnhardt Jr. revealed he is suffering from a concussion and will have to miss the next two Sprint Cup races. What's being said about it? 
Dale Earnhardt Jr.'s string of 461 consecutive Sprint Cup starts will fall off the following list of active streaks now that he's been ruled out of action.