RT @WSJ: From athletes to the elderly, the science of trips and falls: http://on.wsj.com/14CPRN5 pic.twitter.com/GDZHDuaRMh
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RT @WSJ: From athletes to the elderly, the science of trips and falls: http://on.wsj.com/14CPRN5 pic.twitter.com/GDZHDuaRMh
@WSJ how many hits from a baseball bat does it take to make a baby trip?
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