Mayim Bialik (Amy) is actually the only cast member to have a PhD.
In 2008, she completed her neuroscience studies. Something that was actually mentioned in Season 1 of The Big Bang Theory, two years before Bialik joined the cast.
In the episode The Bat Jar Conjecture, the boys are one person short for their Physics Bowl team...
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Things You Didn't Know About The Big Bang Theory
FanfictionHere are some mind-blowing facts that you probably didn't know about The Big Bang Theory.