Science: Yankee Scientist

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To U.S. scientists, the turning point of World War II was March 20, 1943. That was the day that U-boat sinkings began to sag like a beaten fighter. Bigger and bloodier battles have since been—and are yet to be—fought, but, in the scientists' log, none more decisive. And no one knows better than they how close the United Nations came to losing the crucial Battle of the Atlantic.

Last week a small part of the story could be told. The struggle against the U-boats was primarily a battle of technology, and in the...

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