The paper demonstrated the hypothesis through a complicated experiment in which college students were asked to make a judgment about something they could not know for certain -- guessing someone's weight in a photo -- before having their moods swayed either positively, negatively or neutrally by snippets from films intended to provoke either anger, euphoria or no strong feelings.

CNN: When emotion takes over

They were asked to make predictions for 2013 with three sets of odds: Something that is pretty certain, predictions that are rather more risky, and finally ones that are complete wild cards.

WSJ: Tech Europe: Predictions for the coming year