Head injuries

FILE - In this May 20, 2000, file photo, Dale Earnhardt, left, embraces his son Dale Earnhardt Jr, right, in victory lane after Dale Earnhardt Jr won The Winston All-Star auto race at Lowe's Motor Speedway in Concord, N.C. Dale Earnhardt Jr. abruptly announced his retirement at the end of the season Tuesday, April 25, 2017, a decision that will cost NASCAR its most popular driver as the series scrambles to rebuild its fan base. (AP Photo/Chuck Burton, File)
April 25, 2017 - 3:19 pm
CHARLOTTE, N.C. (AP) — Dale Earnhardt Jr. abruptly announced his retirement at the end of the season Tuesday, a decision that will cost NASCAR its most popular driver as the series scrambles to rebuild its fan base. At a news conference, Earnhardt said he "wanted the opportunity to go out on his...
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FILE - In this May 5, 1999, file photo, Dale Earnhardt, Jr., of Kannapolis, N.C., left, listens to a crew member as he sits in his Winston Cup race car before a practice session at Lowe's Motor Speedway in Concord, N.C., where Earnhardt, the current NASCAR Busch Grand National champion, is attempting to qualify for his first Winston Cup race. Hendrick Motorsports says Dale Earnhardt Jr. will retire at the end of this season. (AP Photo/Chuck Burton, File)
April 25, 2017 - 11:59 am
CHARLOTTE, N.C. (AP) — Dale Earnhardt Jr. abruptly announced his retirement at the end of the season Tuesday, a decision that will cost NASCAR its most popular driver as the series scrambles to rebuild its fan base. Colorful, candid and talented, Earnhardt has been plagued by concussions the last...
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FILE - In this Feb. 20, 2016, file photo, Dale Earnhardt Jr looks from the garage before practice at Daytona International Speedway in Daytona Beach, Fla. Hendrick Motorsports says Dale Earnhardt Jr. will retire at the end of this season. (AP Photo/Wilfredo Lee, File)
April 25, 2017 - 10:26 am
CHARLOTTE, N.C. (AP) — Dale Earnhardt Jr. abruptly announced his retirement at the end of the season Tuesday, a decision that will cost NASCAR its most popular driver as the series scrambles to rebuild its fan base. Colorful, candid and talented, Earnhardt has been plagued by concussions the last...
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San Francisco Giants manager Bruce Bochy, left, checks Buster Posey on the ground at home plate after he was hit by Arizona Diamondbacks starting pitcher Taijuan Walker in the first inning of a baseball game Monday, April 10, 2017, in San Francisco. Posey was taken out of the game. (AP Photo/Eric Risberg)
April 11, 2017 - 8:24 pm
SAN FRANCISCO (AP) — Catcher Buster Posey was placed on the seven-day disabled list with concussion symptoms Tuesday, a day after he was struck in the helmet by a 94 mph fastball from Arizona's Taijuan Walker. While manager Bruce Bochy said following Monday's 4-1 victory that Posey was doing fine,...
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