"The Big Bang Theory" is full of intriguing trivia. Welcome to MsMojo, and today we’re counting down some fun facts about “The Big Bang Theory” that even the show’s biggest fans might not know. Our countdown includes Penny wasn't in the original pilot, Mayim Bialik has a PhD, scientific episode titles, and more! Did any of these “Big Bang” facts come as a BIG surprise to YOU? Let us know in the comments!

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