The first radars of World War II could detect invading aircraft (giving the R.A.F. a big advantage in the Battle of Britain), but they were not much good on smaller targets. Modern radar is vastly more sophisticated, and a wondrous new refinement is an eye developed by the Army Signal Corps in collaboration with Hazeltine Corp. It can stare through darkness or fog at a terrain of tangled scrub and tell if a man is crawling through it two miles away; it can look at a walking human six miles away and tell whether...
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