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A Polistes dominula paper wasp lights on a flower. (Elizabeth Tibbetts/University of Michigan) At a Glance Transitive inference was once thought to be an exclusively human ability. The study shows wasps were able to learn which color in a pair was "safe." Even with brains smaller than a grain of rice, paper wasps have the ability to use a form of reasoning once thought to exist only in humans, a University of Michigan study has found. The study provides the...