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Leonard Gives Penny Swiss Hints
Watch The Big Bang Theory Season 3 Episode 15
"The Large Hadron Collision"
Original Air Date:

When Leonard is giving a plus one to go to Switzerland to see the Large Hadron Collider on Valentine's Day, Sheldon tries to convince Leonard to take him over Penny.

What's the Answer?!?
Watch The Big Bang Theory Season 3 Episode 14
"The Einstein Approximation"
Original Air Date:

Sheldon gets a job at the Cheesecake factory to help his solve a theory; Leonard and Wolowitz steal Raj's idea for a double date.

Sheldon on a Ledge
Watch The Big Bang Theory Season 3 Episode 13
"The Bozeman Reaction"
Original Air Date:

When Leonard and Sheldon's apartment gets robbed, their friends help them devise a security system.

Raj and Abby Get Close
Watch The Big Bang Theory Season 3 Episode 12
"The Psychic Vortex"
Original Air Date:

Sheldon and Raj attend a university mixer where Raj meets Abby (Danica McKellar); Leonard is upset to find out that Penny believes in psychics.

Beverly Hugs Leonard
Watch The Big Bang Theory Season 3 Episode 11
"The Maternal Congruence"
Original Air Date:

Leonard's mother, Beverly (Christine Baranski), is back and Leonard is upset to find out she's getting divorced and told Sheldon, not him.

Wolowitz Gets Jealous
Watch The Big Bang Theory Season 3 Episode 10
"The Gorilla Experiment"
Original Air Date:

Penny seeks Sheldon's help to better understand Leonard's work; Wolowitz gets jealous when Leonard and Bernadette become friends.

Wolowitz and Bernadette Kiss
Watch The Big Bang Theory Season 3 Episode 9
"The Vengeance Formulation"
Original Air Date:

When Kripke embarrasses Sheldon on NPR, he swears revenge; Wolowitz is scared to commit to Bernadette.

Camping with a Computer
Watch The Big Bang Theory Season 3 Episode 8
"The Adhesive Duck Deficiency"
Original Air Date:

When Leonard, Raj and Wolowitz go camping, an injured Penny must rely on Sheldon for help.

Sheldon Shows Off Board Game
Watch The Big Bang Theory Season 3 Episode 7
"The Guitarist Amplification"
Original Air Date:

When Penny's musician ex-boyfriend wants to crash on her couch, Leonard and Penny fight and Sheldon tries to stop them.

Leonard in Football Jersey
Watch The Big Bang Theory Season 3 Episode 6
"The Cornhusker Vortex"
Original Air Date:

Leonard gets tutored in football by Sheldon; a kite flying mishap causes a fight between Wolowitz and Raj

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TBBT Quotes

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon