Science: Radar

The U.S. has spent half again as much (nearly $3 billion) on radar as on atomic bombs. As a military threat, either in combination with atomic explosives or as a countermeasure, radar is probably as important as atomic power itself. And while the peacetime potentialities of atomic power are still only a hope, radar already is a vast going concern—a $2 billion-a-year industry, six times as big as the whole prewar radio business.

To fighting men, radar by now is as routine a war tool as a rifle, but it has rewritten the textbooks...