Shaken

Kristy Barrett is a soccer star. She''s been a star since elementary school, and now is so good that she''s been told she may someday make the women''s Olympic team.

Everything changes in an instant, when a blow to her head during a game results in a severe concussion. It''s not her first head injury, but it''s the worst one she''s ever had. The doctors say it will take time to recover; they don''t...