Science: Querns & Crannogs

The tiny islands poking above the blue waters of Lough Gara in Ireland's County Roscommon appeared to be useless lumps of land. No one bothered with them, except an occasional moonshiner who went over in the dark of the moon to turn out his poteen in peace.

Last summer a drainage project dropped the water level in the shallow lake and 112 more islands popped into sight. None was more than 100 ft. in diameter and not until last month did any seem worthy of attention. Then the Resident Works Engineer stumbled on the remains of a Stone Age dugout canoe. Immediately...

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