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As I was improving my machines for the production of intense electrical actions, I was also perfecting the means for observing feeble effects. It was in carrying on this work that for the first time I discovered those mysterious effects which have elicited such unusual interest.
The changes I noted were taking place periodically, and with such a clear suggestion of number and order that they were not traceable to any cause then known to me. I was familiar, of course, with such electrical disturbances as are produced by the sun, Aurora Borealis and earth currents, and I was as sure as I could be of any fact that these variations were due to none of these causes.
It was some time afterward when the thought flashed upon my mind that the disturbances I had observed might be due to an intelligent control. Although I could not decipher their meaning, it was impossible for me to think of them as having been entirely accidental. The feeling is constantly growing on me that I had been the first to hear the greeting of one planet to another.
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Nikola Tesla (Никола Тесла)