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83Thermionic Valves - Electron Tubes - Vacuum Tubes - Lest we forget
Instantaneous long distance wireless communication was made possible by Thermionics. The Electron Tube or Thermionic Valve reigned supreme for about fifty years before semiconductor technology began to erode...
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65How Do Solar Panels Work (simplified)
Almost all energy on this planet comes from the Sun. Oil and gas come from living things that died a very long time ago and those living things all got their energy from the Sun. Even wind currents and...
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