Submarine Bombing
Back when WWII was still around, physics still abled back then, can you believe it. But I all seriousness, back in the 1940's, airplanes would drop gadgets into the water and those gadgets would send waves through the ocean to see if any submarines were underwater. If the wave signal came back the opposite direction, wherever it bounced off was the area of where the submarine was. Waves were useful in military tactics, go physics!
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