their front row and three on their back, and play proceeds as in Round 1. Bin or Win? The two remaining contestants' balls are again closed and put back into the mixer, and one more Killer ball is added to give a total of 11 balls in play. The balls are mixed and placed on a table, with the contestants seated at opposite ends. Starting with the contestant who brought more money into this round, each first chooses one ball to "bin" (eliminate) and then one to "win" (place in the jackpot). Each ball is opened as it is chosen. If a cash ball is chosen to win, its value is added to the potential jackpot; if a Killer is chosen, the jackpot is immediately divided by 10. Any "win" Killers that are found before the first "win" cash ball do not affect the jackpot. The contestants take turns choosing until they have five "win" balls, after which the one remaining ball is opened and binned. Depending on the distribution of the balls in the first two rounds, the number of Killers in play at the start of this round can range from one to six. Split or Steal? Each contestant is given a set of two balls, one each marked "Split" and "Steal," and must secretly choose one to indicate their intentions after looking inside to confirm which is which. The contestants may speak to each other and ask Carrott for advice before making their decision. If both choose Split, they each receive half the jackpot. If one chooses Steal and the other chooses Split, the Steal contestant wins the entire jackpot and the Split contestant leaves with nothing. If both choose Steal, neither contestant wins any money. Transmissions Scientific research Golden Balls has attracted attention from social scientists as a natural experiment on cooperation. A team of economists including Richard Thaler have analysed the decisions of the final contestants and found, among other things, the following: Individual players on average choose split (to cooperate) 53 percent of the time. Contestants' propensity to cooperate is surprisingly high for amounts that would normally be considered consequential but look tiny in their current context, what the authors label a "big peanuts" phenomenon. Contestants are less likely to cooperate if their opponent has tried to vote them off the show in the first two rounds of the game, which is in line