The lead in NBC's "Blossom" as a kid, Bialik went on to get her bachelor's degree in neuroscience, as well as Hebrew and Jewish studies from UCLA in 2000, though she had also been accepted to Harvard and Yale.
She stepped away from her studies in 2005 to go back to acting and made a huge splash as the über-smart Amy Farrah Fowler on "The Big Bang Theory," but she finished her PhD in neuroscience in 2007, specializing in obsessive-compulsive disorder in adolescents with Prader-Willi syndrome.
Bialik also served as one of the guest hosts of "Jeopardy!" last season, and she was named host of the show's primetime specials and spinoff series. She will continue to guest host next season as the search for a host continues following Mike Richards' departure.