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The realm of 1 ______________ of to-day influences almost, every aspect of human activity, while it was only in the beginning of our century that the 2______________ idea, which was 3______________ into one of the most astonishing sciences of our time, was conceived. It was our Russian scientist A. S. Popov, who discovered the principle of wireless 4______________ that finally led to the development of electronic tubes for use in various communication devices.