Corrections and clarifications.

Science · 1993

Where this comes from

Abstract

The Random Sample item, "Russians, U.S. differ on Arctic sub threat" (25 June, p. 1881) should have said that the Sellafield nuclear reprocessing plant has dumped 1 million curies of cesium-137 (not plutonium) into the North Sea. The plant has dumped more than 18,000 curies of plutonium.