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Danica McKellar is on a mission. She wants girls to love math -- and their bodies.Best known as Winnie from "The Wonder Years," McKellar is also a serious brainiac, with a summa cum laude degree from UCLA and a mathematical physics theorem that bears her name. (It's the Chayes-McKellar-Winn Theorem.) The author of "Math Doesn't Suck," she has a new book called "Girls Get Curves," celebrating the

Danica McKellar is on a mission. She wants girls to love math -- and their bodies.

Best known as Winnie from "The Wonder Years," McKellar is also a serious brainiac, with a summa cum laude degree from UCLA and a mathematical physics theorem that bears her name. (It's the Chayes-McKellar-Winn Theorem.) The author of "Math Doesn't Suck," she has a new book called "Girls Get Curves," celebrating the glories of geometry.

And she's not just talking about quadrilaterals. The geometry years (not to be confused with the wonder years) hit right around the same age many girls start to really struggle with their self-image.

What's your body image like? Take our survey and tune in Monday to TODAY to hear Danica talk about math and self-esteem.