If you watch the show, you'll know who I mean. If you don't, I'll explain for ya :D
On the show, the 2 main "nerds" are Leonard Hofstadter and Sheldon Cooper. They are like the "leaders" of the group, just like Paul McCartney and John Lennon were the "leaders" and songwriters of The Beatles.
There are 2 other "nerds", Howard Wolowitz and Rajesh Koothrapali. "Raj" as he's called, is almost like George Harrison. Because later on in life, George had developed an interest in Indian culture after learning how to play the sitar. And considering how shy George often was, Raj is just like him, usually don't talk to girls that often and is, of course, Indian. Howard is like Ringo Starr, right down to the somewhat large, yet very attractive nose and bowl cut hairdo. Although, I'm pretty sure that Ringo never wore skin tight jeans before, although that would probably be funny to imagine. And I'm also sure that Ringo is not lady crazy like the character Howard is. He's been married I think only twice, first to a lovely lady named Maureen Cox and then to a lovely lady named Barbara Bach.
Howard Wolowitz
-Just like: Ringo Starr. Not lady crazy like Howard, but with the big nose and bowl cut hairdo and when they play Rock Band, Howard does the drums, funny, isn't it? Howard is my favorite one, especially when him and his mother are arguing from different parts of his house.
Rajesh Koothrapali
-Just like: George Harrison. Just like George in real life, shy, never talks that much, and is Indian, although George was not Indian, he was interested in the culture
Sheldon Cooper
-Just like: Paul McCartney. Somehow, the "leader" of the group, always made decisions
Leonard Hofstadter
-Just like: John Lennon. Sarcastic, sometimes opinionated, sometimes rebellious. And also like John, he wears glasses
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