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Science  01 Apr 2011:
Vol. 332, Issue 6025, pp. 18-21
DOI: 10.1126/science.332.6025.18-c

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Summary

Cornell University's Lab of Ornithology has launched a popularity tournament featuring North American birds. And archaeologists and volunteers are conducting an experiment to see whether the people who occupied hill forts along the Welsh-English border some 2500 years ago could have seen each other and maybe even sent signals with fire.