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Sheldon wins a National Science Foundation grant to go on a three-month expedition to the North Magnetic Pole to detect magnetic monopoles and prove the validity of string theory. After some hesitation, he decides to go, and wants Leonard, Howard and Raj to join him; although initially reluctant, as it requires spending three months locked in a cabin with Sheldon, they agree. To prepare for the cold weather, Sheldon asks Penny to give them access to the freezer at the Cheesecake Factory. When Penny learns that Leonard is also going, she is seemingly upset. Later, she gives him a Snuggie as a gift, says she'll miss him, and gives him an unusually long hug. On the morning of the guys' departure, Leonard asks Penny what the gift and the long hug meant, but she doesn't reveal her true feelings for him. On...


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