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Sheldon Lee Cooper (Jim Parsons) is a theoretical physicist, possessing a BS, MS, Ph D, a Sc. Originally from East Texas, he was a child prodigy, as he had received his Ph D at age 16.He is usually cold, self-centered, condescending, and immature, but at the same time it is commonly not intentionally hurtful and is in a well-meaning way; He just doesn't know any better.
Leonard dated Penny for most of season three, although they had dated briefly at the end of season one.
A running gag has him always knocking on doors in a pattern of three knocks and one call repeated three times, which he has the urge to complete no matter what.
Sheldon has major difficulties in social settings; he shows great difficulty in identifying sarcasm and irony, and a recurring topic is his efforts to acquire those skills.
Beverly Hofstadter, is a neuroscientist and world-renowned psychiatrist, his sister is a medical researcher, and his father, Dr. Also, his brother Michael is a Harvard law professor.
He is known to be lactose intolerant, and is also known for playing the cello.
He usually wears clothing emblazoned with logos for these interests as well as science-related designs.