Head injuries can cut short careers and cause permanent, irreversible brain damage. Preventing them is a primary goal for many doctors, researchers, and NFL executives. Some school kids in ... more 
Head injuries can cut short careers and cause permanent, irreversible brain damage. Preventing them is a primary goal for many doctors, researchers, and NFL executives. Some school kids in Massachusetts are also trying to tackle the problem. Ken Macleod reports. less 
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Sat, May 25, 2013 1:21 PM EDT