Eddy commits an unselfish deed by replacing a dead bulb on a Christmas tree, prompting Santa to deliver presents to all of the kids in the cul-de-sac. It is clear that one selfless act isn't enough to change his character, however, as he takes everyone's presents for himself.

Examines the controversial use of expected frequencies in the Dreyfus Affair.

Chidi is goes insane while teaching his class and explains a few philisophical theories.

Meredith teaches the new interns about how to talk to families about death.

How Institutional Review Boards ensure that science is ethically bound.