Summary

Like his roommate and best friend, Leonard, Sheldon Cooper is a physicist at Caltech. He's single and is quite socially inept when compared to Leonard.

One of the biggest differences between he and Leonard is Sheldon doesn't seek the approval of other scientists. He knows he is brilliant and doesn't need others to confirm what he already knows. It makes for an interesting dynamic in the apartment sometimes and has even led to a fight.

It's been well documented that Sheldon is a neat freak. When he saw that Penny's apartment was a mess, he took it upon himself to clean it up in the middle of the night.

Sheldon recently got sick thanks to something Penny brought with her when she returned from a trip back home to Nebraska.