3) Danica McKellar
McKellar played the popular and pretty Winnie Cooper on The Wonder Years from 1988-1993. After the series ended, McKellar found it difficult to transition from a child to an adult actor. She guest starred in various roles and finally decided to pursue other goals through post-secondary education. In 1998, McKellar earned a Bachelor of Science in Mathematics with highest honors and wrote four books which encourage young girls to consider careers in mathematics and science.