http://www.cnn.com/video/?hpt=hp_t2#/video/bestoftv/2011/11/29/exp-am-gupta-soccer-concussions.cnn
Dr. Gupta (click on video link above) says no more than 1300 head bumps with a soccer ball a year for kids. More can lead to American football type concussions. On the other hand, Malcolm Gladwell still insists to be really, really good at something -- say soccer -- one needs at least 10,000 hours of practice.
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