Our ancestors might not play with marbles, but wrinkled fingers could make it easier for them to climb around in the wet forests and catch fish from rivers.
我们的祖先可能不会玩弹珠，但起皱的手指可以让他们更容易在潮湿的森林里爬来爬去和从河里抓鱼。
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Abhijit Banerjee grew up in Kolkata envying them: poor kids always had time to play and they routinely beat him at marbles.