Columbia University [Man watching a couple talking.]
Columbia University [Students talking.]
Columbia University [Students talking on a staircase.]
Columbia University [Two men talking.]
Columbia University [Woman talking to two men.]
Columbia University [Students talking in a stairway.]
Columbia University [Couple hugging.]
Columbia University [Three professors talking in front of a chalkboard.]
Columbia University [Professor teaching a class.]
Columbia University [Group of men sitting at table.]