The Best Episodes Written By Richard A. rosenstock

Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.

Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.

When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.

Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.

Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

Sheldon and the gang are confused when a young grad student is attracted to him.

After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.

At UC Irvine things get steamy when George-Michael finds himself in a love triangle with his best friend Ray and his girlfriend Becky.

Penny's home business turns into a complete nightmare when Sheldon takes over.

A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny.

Lucille finds that her children have started dividing up her things, and adjusts to her new home.

Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification.

Sheldon creates a scientific procedure for making friends.

Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.

Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.

The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.

Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.

Tobias returns to his roots and reunites with his leading lady after a rough few weeks.

A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.

Lindsay continues to push away from being a Bluth by embracing a relationship and finding a new career.

Sheldon becomes Leonard's teacher in order to understand football, while an incident with flying a kite threatens Howard and Raj's friendship.

George Sr. comes up with a get rich quick scam after his family falls apart.

George Sr.'s new business hits a rough patch, and he must bribe a politician to get his scam back on track.

Leonard asks Penny for advice when his new relationship starts moving too fast.