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About the Cover


Excavation in 1989 of the Lower Town of Tell Leilan, a large third millennium city in northern Mesopotamia (present-day northeast Syria); the excavation exposed 600 square meters of an urban street and a residential area occupied from 2600 to 2200 B.C. After a volcanic event, which deposited tephra on the roofs of these houses, and a subsequent abrupt change in climate, much of northern Mesopotamia was abandoned. See page 995 and the News story on page 985. [Photo: Anwar abd el-Ghafour]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)