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I think a mathematical formula that has yet to be solved on Earth would be a great start; other formulas for free energy or faster than light speed travel, discussions of metals and elements we don't have here and their properties which could be verified by future research, an encyclopedia galactica (bow to the movie 'Contact') with pictures and descriptions of life on other planets, their animals, plants, languages, civilization, everything.
At some point the information download would overwhelm what could conceivably be hoaxed and would amount to either the world's best work of science fiction, or proof.
Edited to say that I didn't see your not allowing pictures; but ATS has a way of posting both pictures and video; either way, I think enough of an information download could be accomplished simply by giving away scientific information we don't yet have access to.edit on 5001112pmFridayf01Fri, 28 Feb 2014 23:01:50 -0600America/Chicago by signalfire because: (no reason given)