"To be sure, we do not have no absolute proof that mars is inhabited [...] Personally, I have my faith on the feeble planetary electrical disturbances which I discovered in the summer of 1899, and which according to my investigations, could not have originated from the Sun, the Moon, of Venus. Further study since has satisfied me they must have emanated from Mars. - Nikola Tesla"
January 1, 1970
https://en.wikiquote.org/wiki/Teslascope