Danica Mae McKellar (born January 3, 1975) is an American actress, author, mathematician, and education advocate. She is well known for her role as Kevin Arnold’s on-again, off-again girlfriend Winnie Cooper in the television series The Wonder Years, and later wrote four non-fiction books: Math Doesn’t Suck, Kiss My Math, Hot X: Algebra Exposed and Girls Get Curves: Geometry Takes Shape, which encourage middle-school and high-school girls to have confidence and succeed in mathematics.

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