Remember Winnie Cooper? She was the object of Kevin Arnold's affection on the hit ABC show "The Wonder Years."
Well Winnie -- actress Danica McKellar -- is all grown up now and not only is she still acting, but she's writing books for teen girls!
She already has three New York Times bestsellers: "Kiss My Math," "Math Doesn't Suck," and "Hot X, Algebra Exposed!" Her latest book is taking on geometry and self-esteem.
Read an Excerpt : "Girls Get Curves: Geometry Takes Shape"
Check out the video above to hear why McKellar says math skills can help empower girls.