Kaley Cuoco, known for "The Big Bang Theory," isn't just talented in acting. She is also a skilled tennis player, a sport she has been playing since she was three years old. Surprisingly, Cuoco was not the original choice for the TV show, but the network decided to air the show only after Cuoco replaced Amanda Walsh as Penny. Mayim Bialik, another star from the series, is as intelligent in real life as she is on-screen. Despite offers from Ivy League Schools, she chose UCLA. Bialik also reveals her strong sense of individualism in daily life, creating her hair care products and not using any commercially available brands. Another intelligent and talented actress, Melissa Rauch, was so in love with the series that even before joining the cast in Season 3, she was already a big fan. She discreetly played the aficionado on set and eventually landed a lucrative deal with Warner Bros. Television for the show.