Radar was invented in the late 1800s by Heinrich Hertz, a German physicist, after whom the kilohertz was named.
COLORADO SPRINGS, Colo. — Air Force officials are pursuing a space-based system to detect airborne threats and pushing off ...
PITTSBURGH — Watch Channel 11 News - or when we’re not on the air - you can get updates in our FREE Severe Weather Team 11 app for iOS and Android.
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