The Big Bang Theory (2007– )
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The Cooper-Hofstadter Polarization 

Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon doesn't.



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Episode complete credited cast:
Chinese Leonard
Chinese Sheldon


Leonard finds a letter in the trash can, the letter an invitation for him and Sheldon to speak at an upcoming conference on the topic of their latest joint research findings. Sheldon threw the letter out since he didn't want to do it. This brings to the forefront several issues. Has Sheldon thrown out any other important letters to Leonard? Who has the right to their joint intellectual property, especially if Leonard wants to present? Whose idea was the research to begin with? In Penny's eyes, does Leonard own anything appropriate to wear to the conference? Can Leonard and Sheldon come to a compromise so that they will speak to each other and be friends again? Written by Huggo

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Comedy | Romance


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Release Date:

17 March 2008 (USA)  »

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Did You Know?


Sheldon feels Leonard's chance of winning a Nobel Prize is non-existent, as he also said in the pilot episode. See more »


The supersolid was discovered about 30 years before this aired. See more »


Leonard Hofstadter: Hang on. Hang on. Do you not realize what we just did?
Penny: Yeah, you turned your stereo down with your laptop.
Leonard Hofstadter: Ah, no, we turned out stereo down by sending a signal around the world via the internet.
Penny: Ohhhh. You know, you can just get one of those universal remotes from Radio Shack. They're really cheap.
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Crazy Credits

CHUCK LORRE PRODUCTIONS, #196 my soul's journey To let go of the fear and anger which imprisons my heart, To relinquish all childish expectations and live joyfully in the world as it is -- not as I wish or imagine it to be, To be free of the always craven and ever-craving ego, To be released from the endless hungers of the body, To see God in others, To see God in everything, To die without death and merge my consciousness into the cosmic sea of bliss from which I came, To crank out two sitcoms a week that can compete with a deaf chick dancing her ass off... This is my soul's journey. See more »


References Scanners (1981) See more »


Also Sprach Zarathustra
Composed by Richard Strauss
[The piece is playing when Howard turns on the stereo from his laptop]
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User Reviews

The Coopeer-Hofstadter Polarization is a hilarious comeback for "The Big Bang Theory"
31 March 2008 | by (Baton Rouge, La.) – See all my reviews

While Sheldon, Leonard, Howard, and Raj are being awestruck at the way they've used the internet to communicate with the world in order to turn on the lamp, stereo, and other electrical appliances, Leonard discovers a letter inviting him and Sheldon to share their scientific knowledge to an audience of fellow colleagues. Sheldon threw it away because he doesn't feel the need to share while Leonard decides to go and has Penny help with the wardrobe. Penny tries to patch things up with the two former buddies but inadvertently makes things worse. So with her, Howard, and Raj in the audience, Leonard presents his theories to a crowd of 25 before Sheldon reveals himself among them as they get into a knock-down fight in front of everyone. Suffice it to say, Howard sent his cell-phone version to YouTube which also accepted his same-place filming of him and a sleepy Penny with the caption of "his girlfriend". We find out later that a couple of nerds in China have seen this and are also awestruck at their lamps turning on and off at will...With the strike finally over (congrats to the writers for getting much of what they deserve), CBS presented an all-new Monday comedy lineup starting with this one in the middle of March. With this episode, "The Big Bang Theory" comes back funnier than ever! Loved the references to Scanners whenever Sheldon tries to "blow" up Leonard's head. There's also a running joke told by Leonard that only Penny doesn't get. And how about those clothes Penny tries to discard or the model city of Kandor she discovers. All I can say is, bravo to CBS for renewing this very entertaining show for a second season. Oh, and loved Chuck Lorre's reference to producing two shows competing with a "deaf diva dancing her (behind) off" on his vanity card at the close!

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