Anthropologist Nina Jablonski stops by to talk about skin, and attend Stephen's $10,000 a plate dinner to find out if it's getting too expensive to run for President. (0:29)
The election on his mind, Stephen takes a trip to Harvard University, where he sets the students of the John F. Kennedy School of Government straight. (6:22)
Stephen's set to announce the winner of the Green Screen Challenge -- but not without paying tribute, in montage form, to the many heroes who submitted entries. (2:37)
Stephen reminds his viewers that just because the numbers on the board are between one and five hundred, that doesn't mean the number he's thinking of is. (3:28)