Why are some children better at sharing than others? One attempt to find out uses what you could call the "Bamba test". In a large, playroom-like lab, a 3-year-old spends an hour or so playing games with a friendly woman, before snack time is announced. The adult brings out two packs of Bambas - peanut-butter-flavoured corn puffs much coveted in this part of the world. The child's pack, like every normal one, holds 24 of the treats. But when the woman opens hers, she dumps out the contents and cries: "Mine has only three!" Will the 3-year-old share without being asked?
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