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How did scientists detect radio waves before radios even existed? 📡 In this episode of Science Live, Dr. Billings demonstrates the coherer—a simple device made that could sense radio waves long before modern technology. Using everyday materials, he shows how to build a working coherer that can detect radio waves, demonstrating the early invention that made long-distance communication possible. Watch as invisible signals turn into visible results—and see how one small invention helped change the
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