Neurologists say girls can be more prone to concussion because they sometimes have weaker neck muscles that cause the head to flop and the brain to shake.
It's a heady time for women's soccer. But other women's sports want to take advantage of the moment as well. And they're hoping to overcome cultural obstacles that traditionally have made their sports less relevant.
"Dear John, I adore and respect you but please please keep me out of your statements that are not factually based."