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level rise covered more land.Once in the water,fish absorb mer cury through their gills and their food. To find out whether this problem was more widespread,ar- chaeologist Hans Peter Blankholm of the Arctic University of Norway and colleagues selected eight archaeological sites from the shores of the Norwegian Arctic,an area known as Varanger. The bones of seals and the cod at these sites contained 15-20 times the recommended levels of cadmium (and up to four times the recommended levels of lead that are considered safe in meat.The level of mercury was also high in both animals. Blankholm calls these levels of heavy metals in seafood "un healthy,if not unsafe".But he says it's unclear how much the diet of these prehistoric people would have harmed them.Balan-