Sheldon and Leonard are invited to present their joint research paper at an academic conference. Sheldon forbids Leonard from presenting it which results in a physical confrontation between them.br S01E09 - The Cooper-Hofstadter Polarizationbr br #shellypenny #sheldoncooper #thebigbangtheory br br DISCLAIMER:br Some of the links in description may be affiliate links. br This means that if you click on one of the links and make a purchase, br I may receive a commission (at no extra charge to you).