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Picking winners
View larger image | In a new study, volunteers predicted whether cherries or a peach would next appear on a slot machine programmed to frequently alternate the symbols (top) or to deliver them in clusters (bottom). People appeared to expect streaks in both cases. Credit: Source: B. Scheibehenne et al/Evol. & Hum. Beh. 2011, adapted by E. Feliciano

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