Chidi teaches the Trolley Problem.

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.

Gives examples of some ways scientists can try increasing the replicability of experiments and studies.

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.