The capacity to engage in shared tasks such as hunting large game and building cities may be what separated modern humans from our primate cousins
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At a psychology laboratory in Leipzig, Germany, two toddlers eye gummy bears that lie on a board beyond their reach. To get the treats, both tots must pull in tandem on either end of a rope. If only one child pulls, the rope detaches, and they wind up with nothing.
A few miles away, in a plexiglass enclosure at Pongoland, the ape facility at the Leipzig Zoo, researchers repeat the identical experiment, but this time with two chimpanzees. If the primates pass the rope-and-board test, each one gets a fruit treat.
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