hitting a soccer ball might be bad for the brain but when compared to head on collisions this football, hitting a soccer ball might seem okay but researchers say even mild hits to a soccer player's head might damage the brain at a deep molecular level. a study looked at the brain scans of 37 young, healthy soccer players. it compared it to the number of times players said they headed the ball. the more they headed the ball the worse their memory tests were. george zimmerman back in court for the third day of jury selection in his murder trial. he has seemed engaged in the process. he's been taking notes and chatting with his attorneys as they question the people who decide his fate. zimmerman said he shot 17-year-old trayvon martin in self-defense in february of last year in sanford, florida.