Of all the weapons of modern warfare, none is more venerable than radar. The seemingly magical technology that enables planes, ships and artillery units to spot the enemy from afar has made the difference between defeat and victory in many a battle. In a Nova TV episode called Echoes of War, which was shown on the Public Broadcasting System last week, radar was hailed as the military's unsung hero of World War II. As physicist I.I. Rabi once recalled, "Maybe we could have won it without the atomic bomb . . . but without radar we could have lost it."
Yet...
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