Skimming the Surface: Tesla’s Waves Return

A favorite idea of Nikola Tesla a century ago, the use of waves that skim the surface of the earth to communicate wirelessly is coming back into vogue. […]

“An inexpensive instrument, not bigger than a watch, will enable its bearer to hear anywhere, on sea or land, music or song, the speech of a political leader, the address of an eminent man of science, or the sermon of an eloquent clergyman,” Tesla wrote in 1908.

Perfect for your covert espionage operations.

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