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Give one monkey a grape and her neighbour a cucumber for the same work, and the cucumber may come flying back. What animal experiments reveal about where our sense of fairness comes from, and why scientists still argue about it.
In a long-running experiment in Seattle, crows learned to scold a single masked face and kept doing it for years, even birds that had never seen the original "crime". What that tells us about corvid intelligence and how to stay on their good side.
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