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I answers this in my Hub What an Alien SETI Program Would Learn from Earth’s Signals
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Through math, it's something that is not culturally biased. 1+1=2 even if you don't have hands to count on.
What do you mean different world? Do you mean a different country? Well...you can try communicate with him Pictionary style or learn their language :)
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Copyright © 2017 HubPages Inc. and respective owners.